Picture this:
A total jerk, though not one free of charm, is on a date with a smiley, intelligent, make-up free babe in a high-end restaurant. He waggles his eyebrow at her. She gives a musical laugh. Then he reaches for his glass and takes a manful gulp of the expensive wine.
... and a lot of it dribbles down his chin, completely beyond his control - an event that will occur every time he drinks something from here on. He'd look like an idiot and I'd cackle from the other end of the restaurant.
So yes, I'd wish that every time my enemy drinks something, they are unable to keep it entirely in their mouth.
But that twisted but fair bastard known as Karma would only come back to do something horrible to me, so really, I wouldn't. Not unless my blood sugar dropped.