It would have to be Risk. I was known to be good at it so everyone would gang up on meand I would scamper off somewhere innoffensive. I would then point out to the others that "so and so'" was being naughty and was coming to get them. they would always start arguing with each other. Come about 10 moves they start knocking each other out the game. I just waited till one player had spread themselves to thin and it was bye bye to them all.

Cue tantrums. :D