Good wishes aren't always good wishes

[RandomGuy]

Granted, but since you wish for nothing, you get air.
I wish that Fawful was my friend

 

[LN1]

Granted, however, he then betrays you in a second attemp to conquer the Mushroom Kingdom.

I wish for stupidity

 

[RandomGuy]

Granted but you turn into a Pianta
I wish I had a magical Pony

 

[Baja]

Granted, but the magical pony uses a defense move that magically kills you.

I wish I was ten again.

 

[MagicalToadette!]

Granted.But you stay 10 for the rest of your life and your brain shrinks making you more stupider by the minute.

 

[RandomGuy]

You made no wish, so you die.
I wish that I was a mage

 

[MagicalToadette!]

Granted. But you kill yourself of depression. I wish had more attention.

 

[Baja]

Granted, but Mario gets angry because it is his series. Mario kills Luigi.
I wish my wishes never went awry.

 

[RandomGuy]

Granted, but you will never get your desire.
I wish Gogeta would unfuse

 

[GalacticPetey]

Granted, but Goku and Vegeta use potrara to become permanently fused as Vegito

I wish for a Super Saiyan 3 sonic the hedgehog

 

[RandomGuy]

Granted but he now has Lord Voldemort's personality
I wish that Wreck It-Ralph will be a good movie

 

[Baja]

Granted, but then the director "throws in the towel" and is never shown.

I wish cows went "ooM"