Steve Martin's first film was a comedy short based on a part of his stand-up routine. The film, entitled "The Absent-Minded Waiter," was made in 1977 and received an Academy Award nomination in 1978 for Best Short Film.
The short basically consists of Steve (his hair is not white, but mostly gray at this point), who is playing the title role, bungling up every step of the way as he waits on a young couple in a restaurant. He takes away their menus before they have a chance to order, welcomes them to the restaurant 3 or 4 times, etc... until he finally, inexplicably gives them each a wad of money and bids them well. It's delivered with that true Steve Martin brand of slapstick.
While the short is not available for purchase, it is included at the end of "Steve Martin Live!" (1980, dir. by Carl Gottlieb), a concert recording of many of his 1979 stand-up appearances which highlights his most popular routines. Steve also reprised the role of the Absent-Minded Waiter in 1979's "The Muppet Movie," as a waiter who serves Kermit and Miss Piggy.