Well, there was the way he walked, that stalking, snakelike movement. And the eyebrows. And the mustache. And the way he talked, usually around the big cigar. I've had a big crush on Groucho Marx since childhood, and this is one of my favorite bits from the Marx Brothers movies. As one who's a sucker for clever rhymes and lyrics, I find "Lydia, oh, Lydia, that encyclopedia," just irresistible. The song is "Lydia the Tattooed Lady," and the movie is At the Circus.
You may have your own favorite Marx Brothers routine or song. Feel free to share. Movie history nerdiness counts as history nerdiness, too.
Photo courtesy Wikipedia.