There was a couple who had an adolescent son. One afternoon at home, the father saw his son engrossed in his video games and he whispered to his wife, "Let's sneak upstairs for a quickie.", and that's what they did. Unfortunately, they forgot to lock the bedroom door. Their son came upstairs to ask them something and he walked into the room without knocking. When he saw them naked and deep into doing the deed, he screamed. The father laughed at his son and continued with what he was doing as his son ran from the room. The next week, the grandmother was there visiting for a few days. One afternoon, the father heard a commotion coming from his son's room and went to check it out. He walked in his son's room and found his son on the bed with grandma and he was giving her the business. The father let out a scream. The son turned to his father and said, "I guess it ain't so funny when it's your mamma!"