Kingdom of the Spiders (1977)

Straight up, this movie is not what anyone would consider 'fine art'. Featuring William Shatner (yes, -that- William Shatner), this film centers around an invasion of a small Arizona community by a horde of tarantulas. Not gigantized, humongous, radiation-enhanced spiders, but what they lack in size they make up for in numbers and pure enthusiasm. A must-see for people who enjoy those movies that are 'so bad, they're good'.