A young boy comes home early from school one day, and upon entering the house, hears a strange noise. Being a curious young man, he decides to investigate and find the source of the sounds. After checking the entire house, the young boy is drawn to his parents room. Opening the door, he finds his parents making love and runs screaming out of the room horrified.
The boy's father laughs and tells his wife that he'll go talk to his son. As he leaves the bedroom, he too hears the strange noise coming from the end of the hall. He opens his son's bedroom door to find the young boy having sex with his grandmother. As the disgusted father screams out "What the hell is going on in here?", his son calmly replies, "Yeah, not so funny when it's your mom, is it?"