A lesson on how to make your cat revert to being a frightened little kitten. Take off his normal collar (a very beaten up Manchester United collar), and replace it with a new collar...that has a bell on it. Watch your cat curl himself up in a ball and not move until you swear you've taken the god-forsaken bell of death off of his collar.
Then let him sit* in your lap until he's sufficently calmed down enough to go hide under the bed for the next 15 minutes.
To get your cat back to normal, let him go collarless for the rest of the afternoon and for good measure, fill his favorite stuffed frog (courtesy of Julie) with a pinch of Cosmic Catnip. He'll be good as new before you know it.
*Note, if you will, the way his feet are curled up in tense anticipation of the bell coming back.