Family Circus Adulterer is Definitely Not Me
The Family Circus newspaper comic strip often features an invisible gremlin named “Not Me” who serves as a scapegoat for the children but the adults use him in the Robot Chicken episode “Choked on a Bottle Cap.”

Mommy has a wild night of sex with who she assumes is her husband but he assures her “it was definitely Not Me!”

The mischievous figure appears and makes a lewd hand gesture for oral sex.