Plot summary
It is Billy's 6th birthday and the neighbors down the street are throwing a birthday party the same day as Billy's. Mr. Harper depresses the clown that Tony hires and he quits Billy's party. Tony and Angela compete against the Harpers to get all of the neighborhood kids to their party, and Tony and Angela end up winning when Mr. Harper ruins his son's cake. However, Tony and Angela realize that they turned into their worst nightmare, the Harpers.
Credits
Adapted from Wikipedia contributors, List of Who's the Boss? episodes. HTML formatting and reference markers removed.