Shame on you all for forgetting the most awesome crossover flick of all time!!!! Big Trouble in Little China mixed martial arts with horror and comedy for good measure! My favorite movie of all time. Some of the best quotes come from this little gem.
For better or worse though, Sci-Fi channel shows some cross genre movies now and then. I think this weeks foray is called Bloodsuckers. It's something about intergalactic vampire hunters. Sounds hokey, but I'm in. I'm with you on the watching a LOT of bad movies barsoomcore. But I think what I love the most about watching so many movies is that there is usually one good line or character in just about every movie I've ever seen. If there's not, then I just block the movie completely out of my mind. To me, it's not a matter of lowering my expectations, but rather not letting myself be close-minded about movies. Not every movie is gonna be a masterpiece, but most are entertaining.
Another good crossover was a war/horror movie called "The Keep" done in the 80's.
Brotherhood of the Wolf mixed horror and martial arts pretty well and is worth a watch if not already viewed by some of you here.
FWIW would label High Plains Drifter as more of a ghost story. No real horror directly involved in this flick, but (like so many of Clint's characters around this time) it hinted that he had come back from the dead for revenge.