The caption has nothing to do with combustible pastimes when I was in college. The person who played the defense counsel in The Trial Of The Century was something of a contortionist (and not the only one in the circus). It's hard to tell from this straight on view but that's a toilet seat he is wriggling his way through. I thought that part of the point of a toilet seat is that you couldn't get through it. Potty humor. The kids thought it was hilarious. Plenty of their parents did, too.