John Huston in The Treasure of the Sierra Madre 

The Treasure of the Sierra Madre (1948)

The wealthy American tourist that Humphrey Bogart’s character keeps touching for cash in The Treasure of the Sierra Madre is played by the film’s director, John Huston.

Apparently it was B. Traven, author of the original novel, who suggested that Huston play the cameo role: he’d seen the director handing out change during location scouting.

According to one rumour, Bogart took directing duties on these scenes, deliberately demanding repeated retakes in order to wind up Huston.