There's actually a word for this. It's called schadenfreude. Literally, it means "enjoyment obtained from the trouble of others." It sounds twisted — and it is. Even more than you might think.

Schadenfreude—raw, gnawing, primal—is the secret glee one takes in another's downfall. Harmless in its cocktail-party variety, but let it fester in grievance and rage, and it signals violence ...