Jerry Seinfeld stopped by The Tonight Show on Thursday night to perform stand-up comedy and do panel with Jay Leno. In his brief stand-up set, Seinfeld talks about the absurdity of caffeinated alcoholic beverages, the people who "work" in coffeeshops, and the ads for sleep medications. It's all connected.

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Afterward, Seinfeld caught up with comedian Jimmy Brogan (who used to be the head monologue writer for the Tonight Show), and later also with Leno.

Among the things we learn in this clip: How playing to a Tonight Show audience is different from a club, and how it impacts the jokes and tags you use; that Brogan and Seinfeld both started at the Comic Strip Live in NYC in the mid-1970s; that Seinfeld's first Tonight Show performance was 30 years ago; that Leno borrowed that hideous green suit for his own first appearance for Johnny Carson in 1977; and that Leno unbuttons his shirts too far.