In the Warner Brothers show "Charmed" after Piper, Prue, and Phoebe vanquish a demon look to the right or center at the very next scene where they usually recap the episode and the lesson they learned. In almost every episode aired so far, the actor who played the demon who was vanquished in that particualar episode is an extra in the scene. There's usually someon in front of him, so just keep a careful watch!

(Hint: He has been in every scene following the demon's vanquishment when they show dancers at Piper's club, "P3."