Good wishes aren't always good wishes

Granted, but the moment you try to get on it, I, the fat guy, and the large rock all fall on top of you and everyone dies, including the horse and you.

I wish I had a time machine, so I could save the cake before it gets destroyed.
 
Granted, but the horse bites your hand off trying to eat the sugar cube.

I wish I had donkey, so it can mate with MG1's horse and have a mule, which I will sell for millions of dollars!
 
Granted, but it turns out being 21 isn't really that great after all.

I wish I'd know what to do against the boredom.