The Wickeds (2005)

A group of teenagers head out to an isolated, abandoned home reputed to be haunted where a horror movie is being filmed.  The house is locked up since it's Saturday (yeah, no one films on Saturday) so they break in to explore and utter stupid things like, "Look! It's a real movie light!"

Meanwhile in the nearby cemetery, two grave robbers take an amulet off a white faced corpse who turns out to be a vampire and bites one of them.  This causes zombie minions to pop out of the ground and give chase, as much as a shambling corpse can.

The robbers, one of which is Ron Jeremy, end up at the abandoned house with the kids.  The menace outside causes panic and they all argue about what to do and how to escape.  Unfortunately they're all idiots.

There is also a ghost in the house which doesn't do much, and no one is smart enough to figure out they can just get in their SUV and drive away - until after the guy with the keys disappears.