Hey everyone

I'm looking for the name of an awesome horror movie I saw about 10 years ago (it's probably from the 80's) . I don't remember the story, only a few scenes :
- a guy playing basketball with his own head
- a group fighting off demons with their own accessories (1 guy had a water gun filled with holy water)
- at the end of the movie when they battle the strongest demon it transforms into a snakelike beast
-in the final scene a girl picks up some lipstick, a snake emerges from it and the credits start rolling

I know I'm being very vague here, but i hope someone out there knows what I'm talking about :p