“Thanksgiving” started as a joke. When the experiment known as “Grindhouse” hit theaters in 2007, it came packaged with trailers for fake movies, and one of those fictional flicks was a slasher movie set around the most gluttonous of holidays. Some sixteen years later, director Eli Roth turned the fake trailer into a real film with his slasher pic “Thanksgiving,” which hits Blu-ray this week. Turning a joke trailer into a full-fledged feature could’ve backfired, but Roth actually pulls it off here. I’ll confess I’m not really a fan of Roth’s work, but I enjoyed “Thanksgiving” immensely, primarily because it’s a slasher pic that remembers to have fun with its premise. Don’t get me wrong — I love our current trend of bleak, existential horror. But sometimes I just want an old-fashioned fright-fest, and on that front, “Thanksgiving.” One year after a tragic Black Friday event, a killer dressed as a pilgrim is stalking Plymouth, Massachusetts, and, yep, you guessed it — there will be no leftovers.

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