Kolumbo

This episode of "Columbo" features a pretty clever twist. The two murderers are college kids that aspire to be lawyers, so they get to 'help' Columbo throughout his investigation and throw in as many fake leads as possible. These are really well-written villains, because they clearly show no respect for a character the viewer has been respecting for twenty years. They're just seeing how far they can go, barely able to contain their laughter while talking to Columbo. It makes the inevitable big climax when they're caught so worthwhile.

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.