Dexter disguises Dee Dee as his mother when he needs to have a parent/teacher conference at school; Dexter turns into a crazy clown after being bitten by one at a party.
"Sister Mom": Dexter is so worried about something bad he did at school that, when his mother is called on it, he has Dee Dee turned into their mother instead. "The Laughing": Dexter is accidentally bitten by a clown and turns into one himself at night.—Anonymous