Michael Shannon

He turns up where he has no business being — in a classroom, a car, a stranger's kitchen — and delivers a line or two with total deadpan conviction before vanishing again. Nobody in the show reacts to how strange this is. He wants nothing, explains nothing, and belongs to no plot; he is simply, suddenly there.

The joke is the impression itself: Nick Kroll's flat, gravel-voiced take on the actor's intensity dropped into scenes where it makes no sense whatsoever. Big Mouth is a show built on hormonal chaos and loud confession, so a recurring non sequitur this dry and understated stands out precisely because it refuses to explain itself.