You should respect your parent's partner.
Charles walks into the house carrying a whoopie cushion, and he notices his father's new girlfriend  Susan talking to a group of well dressed people in the kitchen.
Charles wants to amuse himself.
Charles greets Susan before he watches his favorite television show.
Charles slips the whoopie cushion on Susan's chair before hiding behind the couch.
Susan is touched by Charles' actions and hugs him after their other guests leave.
Susan is humiliated when she sits down on the whoopie cushion.