Melvin and Howard (1980, Jonathan Demme)

Melvin is Puppet Master star Paul Le Mat, gives a ride to injured Howard (Jason Robards of A Boy and His Dog, made up to look like John Huston’s ghost). But Melvin’s a fuckup, and the bulk of the story is his getting left by wife Mary Steenburgen, getting back together with her, and getting left again. So it’s not surprising that he later mishandles the late Howard’s handwritten will, resulting in him never getting his share. The real Melvin lived almost 40 years after the movie came out, so hopefully he at least enjoyed his biopic fame.