Altered States (1980)

This movie starts out to be really fun! An asshole scientist (played by William Hurt - is anyone better at playing an asshole intellectual?) believes that by entering a hullucinatory state (taking drugs) he can perhaps regress into visions of the creation of man - identify the true self.

Well, instead he reverts into a caveman, running around and slaughtering goats or sheep at the local zoo. He's still an asshole, and doesn't care that he might hurt people during his caveman state. But his wife still loves him, and they overcome in the end.

I hated the end! Stupid stupid stupid American ending. The effects are terrible, but this was 1980. Why are women naked in movies more than men? But the beginning was fun. You could do worse for a rental.