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 " . Elvis 's 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 Jack 's story , Elvis does spot a mysterious scar on the back of Jack 's head . It could be from the head wound seen in the Zapruder film , but then it might not be
assassination
Assassination of John F. Kennedy
Bubba Ho-Tep