dtgreene: I wish for this wish to be corrupted if and only if it is not.
TwoHandedSword: I neatly sidestep the entire paradox by instead corrupting the wisher. Here, have some absolute power.
I wish I still had the full head of hair I used to have 30 years ago.
Granted, but in order to do this, it was necessary to change your hormonal balance to that of a woman. As a consequence, you are now perceived as female (even if you still have a beard) and, among other things, have grown breasts and have become infertile. (You do not, however, experience periods.)
(If you are already female-bodied, the wish is unable to be granted.)
I wish the gem underflow glitch (from Baldur's Gate 2) worked in real life.