I loved the one where it was a blank screen and it was all voice-overs.
Voice 1: "Hey, there's been a power outage!"
Voice 2: "AAAA! I've gone blind!"
Voice 1: "No, it's just the lights are out. There's no power."
Voice 3: "You don't know that! He may have gone blind independently of the power outage."
Voice 2: "AAAA! I've gone blind!"
Exchanges like that for a full half hour. Fantasticly funny at 1 am or whenever.