when a man has sex with a woman on her period. He pulls his dick out and smacks it across her mouth and says "Why so Serious?"
jack went up to his buddy john and said "man, me and jill were doin it earlier and she didn'tell me she was on her period." john looked up at him and asked "so what'd you do when you found out?" "well," jack said, "i looked at here dead in the eyes and pulled the joker on her."