"Best Worst Movie" *** (out of four): Sweetly amusing documentary about the making of the oft-debated worst movie of all time, "Troll 2", is solely for fans who are in on the joke. After watching this, you'll either run out to rent its subject or thank your lucky stars you've never come across it.

Those of you who regularly read movie reviews may actually seek to avoid bad movies. But there is a subgroup of people out there that actively seeks only the most terrible ones - films so universally reviled that, like Darth Vader, there must be some good in them. It seems inevitable, then, that a movie would be made called "Best Worst Movie" as an attempt to crown the lowest of the low. And now we have one. According to this sweetly amusing documentary, the winner is 1990's "Troll 2" - a movie so bad that it violates the basic tenets of being a movie, starting with its title (the film neither contains trolls - it's about goblins - nor is it a sequel to 1986's forgettable Sonny Bono romp, "Troll"). After watching "Best", you'll either run out to rent "Troll 2" or you'll thank your lucky stars you've never come across it.

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