If there were a Mount Rushmore of one-liner/short joke comedians, Mitch Hedberg would certainly be on it. He would most likely be joined by Rodney Dangerfield, Henny Youngman, and Steven Wright. Honorable mentions include Rita Rudner and Anthony Jeselnik. Demetri Martin is no slouch either.
Mitch was in a class of his own in terms of whimsical prowess. Even his saves/recoveries when his jokes fell flat were funnier…