When a man ejaculates in a woman -- only to let the sperm drip out into her hand and flick it back in the mans face.
Man: "Unf! I'm going to explode! RAAHAHHHHAAAAHH!!!"
Woman: "Ok baby, but don't write checks your ass can't cash! You can have a bounced check!" ***FLICK***
Man: "WHAT THE FFFFFFFUUUUUUUUUUUU!!!!!!!!!"