The Muppet Show 1x12

Fozzie gets stuck in a magician's trick cabinet. The cabinet is dragged onstage so that he can perform his act -- and at the end of the act, two pig stagehands tip the box over so he can take a bow. Crazy Harry, who makes frequent appearances (and frequent explosions) during the show, blows up the cage before the end of the show so that Fozzie can escape.