1. "Mac & Charlie Die" (Season 4, Episode 5/6)
Sunny's finest hour (literally… it's a two-parter): One storyline revolves around Mac and Charlie clumsily faking their own deaths to try and elude Mac's recently paroled father, whom they claim has threatened to "rape [them] so hard the room would stink." The other plot concerns the discovery of a glory hole in the pub men's room — which sets Dennis and Frank on a desperate quest to have anonymous sex with strangers. The supersized episode bounces from one well-executed set-piece to another: an Eyes Wide Shut-esque orgy, a pathetic fake funeral, and a climactic (so to speak) moment when Dennis tries to use the bathroom's new accoutrement. That single image of a penis-shadow thrusting toward Frank's face neatly summarizes this show: This is the tale of five people who take blind chances — and mostly end up screwing each other.