Doonesbury by Garry Trudeau for June 21, 1974
Nixon: Absolutely not! They have all the evidence they need! Aide: Sir, they insist they haven't enough to make a fair judgment... Nixon: I'll be the judge of that!! Hee, hee!! Aide: Ha, ha, ha, ha! Nixon: Ha, ha, ha, ha, ha! Aide: Ha, ha. That's great, sir... and they say you don't have a sense of humor! Nixon: Who does? I want their names. Aide: Uh... yessir. I'll get right on it.