In Hollywood, there's often a fine line between good-natured parody and outright exploitation. You know, should a down-on-their-luck star take the potentially embarrassing "Celebrity Apprentice" gig or not? It can be a real grey area.

Luckily for us, though, Charlie Sheen and Lindsay Lohan still haven't figured out the difference, which is probably why they both have such a large presence in the new trailer for "Scary Movie V."

Hey, if you can't get people to laugh with you, at least you can still get them to laugh at you.

Which is kind of too bad, because honestly, the rest of this new teaser for the fifth installment of the horror parody franchise actually looks sorta funny in a good way. Ashley Tisdale, Heather Locklear, Katt Williams and Terry Crews are among the other stars who gamely deliver punchlines in a clip that sets its sights squarely on "Paranormal Activity" and its found footage ilk.

Still, all the hype so far has been about Sheen and Lohan, appearing together for the first time since the last cover for The National Enquirer. So if you're the kind of person who still gets a charge of schadenfreude from watching stars brought low, this this clip is just what you've been waiting for. Here it is, courtesy of MTV:

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