Two guys are sitting on a bar stool. One starts to insult the other one. He screams, "I slept with your mother!" The bar gets quiet as everyone listens to see what the other weasel will do.
The first again yells, "I SLEPT WITH YOUR MOTHER!"
The other says, "Go home dad you're drunk."
This is just one that would've caused more quarell if the other guy did not reply what he replied. Creative one.