To celebrate the "birthday" of the famous Improv comedy club, 6 famous comedians get up on stage and do their thing. However, to make things interesting, while each one does his particular routine, the other 5 comics sit at the back of the stage and heckle the performer. This video is especially notable for Martin Mull issuing a zinger at Robin Williams that shuts-up the otherwise motor-mouthed comic for at least 5 seconds.
| Actor | Role |
|---|---|
 Robert KleinSelf | Self |
 Billy CrystalSelf | Self |
 Robin WilliamsSelf | Self |
 Martin MullSelf | Self |
 Richard LewisSelf | Self |
 Paul RodríguezSelf | Self |