So what happened when Keith Richards showed up to film his cameo in the next Pirates of the Caribean movie? Here's the answer, compliments of the IMDB:

Keith Richards appearance in the second Pirates Of The Caribbean sequel descended into chaos after he reportedly got so drunk on the movie set, the film's director had to prop him up. The hellraising Rolling Stones guitarist finally shot his long awaited cameo as Johnny Depp's father in Pirates Of The Caribbean: At World's End earlier this summer, but he is unlikely to remember the occasion which concluded months of speculation. Bill Nighy, who plays Davy Jones in the film, tells Empire Online that Richards was inebriated by the time the production team retrieved him from his trailer to shoot his scene, and he required a little support from director Gore Verbinski. The 62-year-old rocker is reported to have remarked, "If you wanted straight, then you got the wrong man."