Ratings speaking, Jay Leno is the King, but when it comes to format, concepts, and all other things, David Letterman is the King. All other Late Night Shows and Host has patterned their shows, skits, even the way of delivering a joke is patterned over Letterman's show.
Naging controversial naman ito ng malapit nang mag retire si Johnny Carson. Pinagpipilian noon sa pagitan ni David Letterman, na host na ng kasunod na show ng Tonight Show, na tinatawag na Late Night with David Letterman, at si Jay Leno na permanent guest host tuwing Lunes ng gabi.