It appears inside your bloodstream and kills you.

I wish to be happy.

Granted. You how have that annoying song "Happy" stuck in your head.

________________#Idontcareifiannoyanyofyou_____________________________

I wish to be the Donut King.

Granted. You eat a lot of donuts and you develope diabetes.

I wish to be the king of England.

The queen of england divorces you and you no longer are king.

I wish to go to the bathroom.

Granted. Your douchebag friend locks you in.

I wish everything would be OK.

Granted, you are on fire and burn to death but that's ok!

I wish that I can wake up 1 hour earlier than before.

Grented, you die of sleep depravation.

I wish I could hide the bodies in the attic instead of the cellar.

They are still found anyways.

I wish to have good friends.

Granted, but they will betray you in the future.

I wish that I can type 15 words per second without breaking my keyboard.

Granted, your keyboard won't break, but your hand surely will...

I wish all violence within the world will go away.