I was browsing channels and came across this old 80's movie (I think). It was near the end of the movie and I came in when this lady was in a diner. She was sitting alone and had poured something into her drink. This creeper looking guy puts a coin into the juke box and plays a creepy song. The guy sits next to the girl and she tells him there is no smoking and he puts the ciggarett out in her food. After refusing to leave, the chick gets up and bumbs into this blonde haired guy who threatens the creeper guy to leave with a switchblade. The lady then goes with him to the woods where they are making out. The lady says she has a surprise for him and she taked off her top. Then the guy says he has a surprise for her and turns into this demon.

I watched it all the way to where this chick was being escorted by the sherrifs to their police car and is put in the back with the lady cop. They offer the chick some doughnuts and when she openes the pink box its filled with worms. Then the cops turn into demons lol

There's 3 main deoms ( I think), a guy with a rifle living with this younger looking girl. That's about all in remember...

Sometimes They Come Back... Again (http://www.imdb.com/title/tt0117692/reference)