Ok, but its german and from my grandmothers mother, so full of moral!!:
"Die Strafe folgt der bösen Tat,
wie der Zwirn der Hosennaht"
~"la peine suit le délit, comme le fil suit la couture du pantalon"~
(can anyone translate into english?)
J'adore ceci, because it makes people very angry
For example when someone teases me and directly after that something funny happens to him, like something in his hand fallls down or he walks into a door or anything, I say that. Its a good "conter".