The Manitou (1978)

A woman discovers a fast-growing tumor on the back of her neck. The doctors schedule next-day surgery, so she goes to see old friend -- a low-rent fortune teller Harry played by Tony Curtis -- to have a roll in the hay. When the surgeon is supernaturally prevented from removing the tumor (which they now believe may contain a fetus), Harry gets to work on figuring out how to deal with it from a mystical perspective.

It is no-holds-barred bonkers. A jacked little person emerging from a neck womb is probably the fourth most wtf thing to occur, with laser-shooting boobs coming in just ahead. It's a mess, but Curtis seems to be having a hell of a time, which makes it worth the watch.

D