Twenty years ago this month, Jackass Number Two arrived in cinemas and made a strange kind of history. Jeff Tremaine's film has no plot, no character arcs, and no interest in the usual consolations of narrative. What it has instead is a group of grown men volunteering their bodies for humiliation, injury and the occasional genuine medical emergency, and a camera crew committed to capturing every second of it. Johnny Knoxville, Chris Pontius, Steve-O, Bam Margera and the rest raise the stakes from the first film with a dedication that sits somewhere between professional pride and religious vocation. The result is funnier than it has any right to be, and more unsettling than most horror films released that year.
The chain that follows takes that willingness seriously. Slapstick has always been a bodily art form, and the best practitioners have understood that comedy and pain share a nervous system. Buster Keaton built a career on it, taking falls that would hospitalise lesser men and keeping his face perfectly still throughout. Jacques Tati turned the body into architecture, all angles and misjudged reach. Harmony Korine's Trash Humpers pushes the same impulse into something deliberately ugly and confrontational. And then there are the performance artists, from Chris Burden to Marina Abramovic, who removed the joke entirely and kept the sacrifice.
What emerges from watching these films in sequence is a genealogy. The Jackass crew are not the heirs of Chaplin so much as the descendants of a tradition that runs through vaudeville, music hall, and the European avant-garde, where the performer's body is the material and the audience's discomfort is part of the point. The laughter does not go away. It just starts to sound different.