If I were a wizard, I think I would want the spell to turn nuclear energy into harmless and distilled water that would involve some really cool, martial-arts, Avatar-looking conjuring moves and a bellowing "Nucleo aqueous!" that would leave no trace of radiation or nuclear activity just water vapors.

Total granola treehugger answer but hey, it would be good!!!

My spell would be "Y-T-M-N-Dementa".

This spell would work by distracting and immobilolizing the opponent with hallucinations based on all of YTMND's best (and the internet's worst) fads. Examples of such fads include, but are not limited to, NEDM, O Rly owl, bill cosby, the King… etc. The spell would last as long as it takes one to stop viewing video after video on youtube. Depending on the person, it could range from a few minutes to a few days.

I feel that this spell would be best because it best represents how the wizarding world and the muggle communities can come together to create something. oh so good.

My spell would be a non-verbal spell, granting me the ability to make people buy anything i happened to be selling. after them saying "no thank you." i would say in my mind, "CONVINCICATE!" they would then realize what a good product i had, and how much they needed it. i would be the most accomplished sales person in the entire world!!!

N-E-R-D.

My spell, those four simple letters, would turn Voldemort into a pocket-protecting, glasses wearing, acne-face loser. His sudden and complete loss of eyesight and magical ability will give me the immediate opportunity to rob him and probably kick him in the nuts a few times.

If I were a bruja, my spell would be one that conjures up bubbles, along with the manipulation and expansion of them…without water (because that would be a waste).
This spell is the best for a few reasons: 1. it's universal, so no more fees in terms of soap/shampoo/detergent 2. great way to make some extra cash at kids' birthday parties 3. it's a pesky fiend to the eyes of any opponent 4. they create a slippery, unruly surface, and 5. your house, dog and car would rival those of Mr. Clean, and the Scrubbing Bubbles bubbles.
The deadly/super fun trigger would be, dibuja burbuja (dee-boo-ha! burr-boo-ha!)

My spell, Incommodo Ludius Eliminato, would do away with all the poeple I find overrated and annoying in the film industry.
Ingredients:
Blood from an intelligent creature
Chicken wishbone
Cherry pits
Hemlock
Rosemary oil
Red wine
A mirror
Tarot card of The Chariot
Fire
Movie Reviews
Spell must be cast with a wind stronger than 4 mph (mountaintop or roof top)
Chant names while circling the burning reviews
The whole spell must be filmed

My spell would be a glamour spell to change my appearance when wanted

"Multiplicatio"

This spell has the power to multiply anything, living or not. If the spell is used to create copies of a living organism, the copies will last for a limited amount of time. This spell is useful in many ways. The first way is very obvious…you could create an army that would fight for you from just one person. You could also create copies of inanimate objects that would last forever. All copies would be indistinguishable from the original, so copies would be just as valuable. You could create unlimited wealth with this ability, and if you were feeling nice, you could solve world hunger.

My spell would turn newspaper into stacks of money. I would call it recyclerous dinari. And I wouldn't be at all selfish with the stacks. I'd hand them out freely as I can always create more with the abundant amounts of newspaper stacks in old man Crowley's apartment in the community I manage.

For me the magic spell that I would use up my cloak would be a simple spell that is a combination of love and contentment. And since it peters on two very everlasting emotional states, the spell, of course, would only be usefully momentarily. But in execution it would render the subject immobile since they would find themselves happy and in a euphoria of love and friendship. Which would leave me enough time to escape or save my friends ^_^

finally i tried firefox and it works

i would love to be able to be in two places at once
lets say i have tickets to a concert but also tickets a a movie premiere why not do both
why not be able to go to both
my spell would be this
me here me there let me be both here and there

weight loss by putting on the cloak one would be able to shed those extra 10-15lbs not working with diet and excercise alone
the spell is self would weightus removus

third has to do with not enuough hours in a day
sometimes i wish i could skip sleep altogether and keep going
however have the same benefits as if one slept for 8 hours or more
so by putting on the cloak and stating awakus awakus! !!!

Have you ever been to a movie and the theater is packed? When you cast the Cinema Exodus spell, it causes the people sitting in the best spots in the theater to suddenly remember somewhere super important they need to be and vacate the seats for you to take and enjoy the movie!

My spell would be designed to affect any and all overpaid public /government officials, entertainers and sports figures as well as CEO's by extracting from their banks and paychecks anything above and beyond what the real world would consider a fair salary for what they do.
The excess funds would be equally distributed immaediately among those who have been fleeced by inflated ticket and parking prices and those who have lost money to these companies as well as all American taxpayers whose monies have disappeared in our vast government wasteland of excess. Movie goers, especially stand to benefit to offset those inflated actor's salaries and high ticket costs (as well as those concession prices—yea for us!)
An option for non salaries funds would be for these individuals to pick one charity per person to receive the dollar value of their "perks and benefits" or ANYTHING obtained by them just being who they are and at the mention of my spell, those monies are transferred immediately to that charity.
My spell is the best because it rights an incredible amount of wrongs in the world and helps those who best need it. Everyone who has attended a pro game, concert, movie or purchased stock , paid taxes or elected someone who has taken advantage of their position stands to benefit so the impact is great. My spell words are "fortunus reversus" and at the circling of my wand, all those excess receivers mentioned are affected in one fell swoop.

leas dar na istigh fainic- literally translates to "Insight of the inner mind" from Gaelic.

Function: Allows one who has been put in a position of immense inner confusion ,such as turmoil over which side to choose; who to trust, etc. Or even something as simple as who am I really in love with or should I cheat on the next test.

It can only be used by one who has mastered Legilimency and/or Occlumency as it requires an intense amount of concentration and an in-depth knowledge of one's own mind and the barriers you've created.

(false history) Once used by the Druids of Olde Ireland to decide their path from a young age. Was transferred to the New Age wizards in the 1600's when Pure Bloods began to allow their children to decide. Only, instead of allowing them to make mistakes that could jeopardize the family reputation and build them as humans, they kept them under the thumb of their bloodline by seeing what was truly desired by the child. Which, at such a young age, the child's only wish would be to please the family.

"Bradify"

This spell would trap my foe in the Brady Bunch World, where he/she would be forced to live out the rest of their days in each episode of the Brady Bunch; appearing randomly as any of the guest characters such as the Milk Man, The Coach, or the wife of the next door neighbor.

In a world where one man, stands the test of time. Mutant Chinchillas have invented a virus to turn everyone into paraplegic turtles. That one man is a wizard. He has the ability to turn these mutant chinchillas – that have fangs – into loving carefree gerbils. This spell is called gerbilic cofalis. If he can fight the evil quanifalha – the master chinchilla – he can invent a giant satellite and channel gerbilic cofalis through the entire world and save everyone forever.

my spell would be to turn my opponent into the zombie kid who likes turtles
they'd look like him and could only say that one thing… and i'd still laugh everytime. http://www.youtube.com/watch?v=CMNry4PE93Y
word would be " turtle-a-dufus"

If I were a wizard, the most powerful spell I would have up my sleeve would be the SOW spell aka “Sleeve of Wizard” spell. This spell would only affect women, causing them to have private parts like a sleeve of a wizard (thank you, Borat). It’s the best spell because even if you cast it on a dude, it’ll automatically translate to any chick he’s the closest with. Thus, causing the woman to be so loose that any possibility of conceiving a child would be thrown out the window(along with the lube.) All in all, SOW would cause world populations to plummet and thus solve our problem of excessive pollution and celebrity adoptions of foreign children.

If I could make a spell it would be to make all living things (animals, fish, reptiles, amphibians- maybe even some plants) talk in whatever language desired with the words
Animalus (or Botanicus) Verboticum followed by the language word (Englishia, Germanica, Frenchosa, Spanishia for example) so world wide these creatures can be our eyes and ears. This spell would be the best for all the unlimited things this would allow us to do.
Pets could tell us what happened at our home while we were gone. Plants could tell us who damaged property in our neighborhood. Countless witnesses could be added for crime trials. We could sent them on errands and with messages to other wizards without writing. They could be sent as spys to unknowing Muggles and it would generally make all people act better knowing that plants and animals can be called upon for information.xt right here!

My spell would be "riflettere." Anytime an opponent sent a harmful spell your way, "riflettere" would reflect the spell and send it back to whoever cast it. It would be a purely defensive spell, but I imagine it would be handy in lots of situations.