Bubba Ho Tep

Bubba HoTep is a 2002 American comedy horror film written, coproduced and directed by Don Coscarelli. It stars Bruce Campbell as Elvis Presley now a resident in a nursing home. The film also stars Ossie Davis as Jack, a black man who claims to be John F. Kennedy, explaining that he was patched up after the assassination, dyed black, and abandoned.

An elderly man at The Shady Rest Retirement Home in East Texas is known to the staff as Sebastian Haff, but claims to be Elvis. He explains that during the 1970s, Elvis Presley Bruce Campbell grew tired of the demands of his fame and switched places with an Elvis impersonator named Sebastian Haff also Campbell. He claims it was Haff who eventually died in 1977, while he, the real Elvis, lived in quiet, happy anonymity and made a living pretending to be himself. After a propane explosion destroyed documentation which was the only proof that he was actually Elvis, he was unable to return to his old lifestyle.A hip injury during a performance causes him to get an infection and slip into a coma. Twenty years later and living at the retirement home as the film opens, he is contemplating his age, frailty, loss of dignity, impotence, and A growth on his pecker. Elviss only friend is a black man named Jack Ossie Davis who insists he is President John F. Kennedy, claiming to have been dyed black after an assassination attempt, and abandoned by Lyndon Johnson in a nursing home. Initially skeptical of Jacks story, Elvis does spot a mysterious scar on the back of Jacks head. It could be from the head wound seen in the Zapruder film, but then it might not be. ........

Source: Wikipedia