Homer Simpson says: "Okay, we've got the secret vigilante handshake. Now we need codenames." [00:11:30]
Compare the handshake with that used by Harpo and Chico Marx in A Night in Casablanca, and that used in the Monty Python skit, How to recognize a freemason.
[1F09] "Homer the Vigilante". Written by John Swartzwelder, directed by Jim Reardon, Original airdate: 06/01/1994.