Movie extras mill about in the background of our favorite TV shows and movies, paid to act like regular folks doing regular stuff while the main actors deliver their performances.
But hiring regular folks to be movie extras can pose a problem if they're not coached on the concept of blending in, like the crazy "businessman" who tries to steal the spotlight in this clip from Ghostbusters.
It can be just as hard to make a kid understand how their fidgeting, or in the case of North By Northwest preemptive ear plugging, may detract from a scene's sense of drama when they're visible behind the actors.
Child extras can also get hurt if the actors aren't careful, which the "Candy Man" almost learned the hard way in this scene from Willy Wonka and the Chocolate Factory.
Watch as the blonde girl in the bottom right corner of the screen narrowly dodges the counter, and a broken jaw, like a little ninja: