httpv://www.youtube.com/watch?v=_Z8AddFYCnA

When Peter Cook died in 1995, John Cleese said of him that while he needed three hours to write a three minute sketch, Cook could do it in three minutes.  And that, Cleese concluded, is the definition of genius: the ability to do it in real time.

Above is a clip from the lovely little English comedy from swinging 1967, Bedazzled, in which Cook, as Satan, tries to make a Faustian bargain with the hapless Stanley Moon, played by Dudley Moore.  And, in making the argument, he illustrates the principle that it is better to reign in hell than serve in heaven.