Nooooo.. wait!..
you have to wish after you grant one--that's how it works.
Here, I'll make up one for you:
Unbreakable: I wish I had aids.
Granted, but... um, well you don't get any symptoms and don't die from it!?
I wish the plague was born in my drippy sinuses, and everyone in the world got it, and 99.999999999999% of them would get died, ala
The Stand.