Improvisational jokes presented in the bloopers. Some may not be improv, there is no way for me to tell.

If you like this check out the Always Sunny sketch show I compiled with all their dvd bonus gags:

Ep 1:    • The Gang Makes A Sketch Show: Episode 1  

Ep 2:    • The Gang Makes A Sketch Show: Episode 2  

Ep 3:    • The Gang Makes A Sketch Show: Episode 3