Stunt casting

Stunt casting is like when you have a big party and your mom invites your favorite famous person to come. They don't really belong there and don't have anything to do with the party, but they come just to make you super happy and surprised. It's like when you watch a TV show or a movie and they bring in a really famous person to make the show more interesting, even if they aren't really part of the main story. It's just a little surprise that makes you go "Ooh, cool!"