I distinctly remember an appearance by Harvey Korman on the show around this time, in which Carson -- for some unknown reason -- quickly and calmly slashed Korman to ribbons, with a rapid-fire series of insults. Clearly Korman was caught off guard, and was not on the set after the following commercial break.
Is this the episode? Did anyone else happen to catch this one? I've tried to track it down using google, etc without much luck.