Erotic Diary of a Lumberjack (1974), which, as is only to be expected of a movie with that title, has practically nothing to do with lumberjacks,
In the Sign of the Virgin (1973), which has nothing whatsoever to do with virgins,
The Living Ghost (1942), which, come to think of it, has nothing to do with ghosts– am I on a roll here, or what?
RoboCop 2 (1990), which breaks the streak by being about not only RoboCop, but another cyborg actually called RoboCop 2 as well,
The Sinful Dwarf (1974), which is exactly what it says on the package,
Truck Stop (1978), which is an extremely revisionist adaptation of the Odyssey. No, really.