The Prize Pest is a 1951 Warner Bros. Looney Tunes cartoon directed by Robert McKimson, and written by Tedd Pierce.
[3] After winning a prize from a radio show, Porky Pig receives an unexpected house guest — Daffy Duck — who refuses to leave.
Daffy claims to have a split personality, turning sweet when treated kindly and monstrous when mistreated.
Falling for Daffy's ruse, Porky agrees to serve him, but secretly plans to call the authorities.
In a twist, Porky catches sight of himself in the mirror wearing the monster costume and frightens himself, realizing he is just as cowardly as he accused Daffy of being.