[whswhs]

I don't think my players have shown much tendency to take them, and I don't make much use of them for NPCs, either. Though looking at the PCs for my current GURPS Fantasy campaign, Tapestry, I see that one of them has the racial disadvantage Selfish (12), which has some kinship with Bad Temper, I think. But Bad Temper feels like kind of a blunt instrument in roleplaying terms.