Rishikim: Columbo
This is another terrific Columbo episode because Peter Falk is just amazing in it. Columbo never appears as smart as he actually is, but here the character has to take playing dumb to a whole new level. He needs the killers to see him as no threat whatsoever, he needs to jump on every obvious red herring that they feed him.
The college kids clearly have no idea who they're dealing with, and he has to pretend that he's not gloating. It's a fantastically nuanced performance by Falk, and it makes this an infinitely rewatchable episode.