Trey Parker and Matt Stone talk to David Letterman about Isaac Hayes, Scientology and the history of South Park:
Bonus: View the "controversial" South Park episode that was too much for Isaac and which may or may not have been pulled by Comedy Central due to pressure from Tom Cruise:
(Click to watch)
"So, Scientology, you may have won THIS battle, but the million-year war for earth has just begun! Temporarily anozinizing our episode will NOT stop us from keeping Thetans forever trapped in your pitiful man-bodies. Curses and drat! You have obstructed us for now, but your feeble bid to save humanity will fail! Hail Xenu!!!"- Trey Parker and Matt Stone, servants of the dark lord Xenu.