A young teenage boy got up in the middle in the night for a drink of water. As he passed by his parents' room, he heard this moaning coming from it. So he opened the door, and they were having sex. The father looked at his son and made a thumbs up.

After they were done, the father got up for a drink when he hears this moaning coming from the kid's room. He looks in his room and he is having sex with his grandmother. The father says, "Son, what the hell are you doing??!! The boy looks at his father and says, "See, it's not so funny when it's your mom, is it?"