Next time someone uses "your mom" to try and burn you, tell them to take a god damn biology lesson for insults can not be telepathicly transmitted from mother to child.
My personal favourite is "Did you get the present I left on your moms face?". Or else just "Did you get the present?" Then when they say no, "The one I left on your moms face".
it can be, i said " it's cheap entertainment" after my teacher abused me for playing with something stupid, the kid next to me goes "Just like your mother?"