there be two type of bad horror film those that be so dull and atrocious that no one like them ( except masochist or mental patient ) and those that be so inept and silly that they be great for a laugh ( such a plan 9 from out space ) . i would put this one in the second category and though it be a bit duller than some of the cheesy old horror film from the 1950s . i would say that it more fun than watch robot monster but not quite as much a teenager from out space . the film be about and you guess it and a giant gila monster that terrorize a small town . one by one and it cause auto and train wreck and then feast on the inhabitant . while this all sound very ridiculous and funny and the film actually play most of the plot very straight . however and inexplicably and it also choose to insert a lot of 50 rock and roll into the film even at moment where it make absolutely no sense at all . for example and near the end of the movie the sheriff finally realize that the accident be be cause by the giant lizard but doesn not warn anyone . so and naturally and the teenager stage a big dance right where the gila monster resides . but to make thing bad and even though many people have just die and the lead actor begin to sing ( a la arch hall and jr. in eegah . ) . huh . about the only decent thing about the plot be the role of the sheriff . aside from the big brain lapse mention above and he seem like a nice guy and actually like the teen and listen to them not like most sheriff in these sort of movie ( like the cop in the blob and invasion of the saucer men and countless other film who ignore the warning ) . consider how slowly the gila monster move in the film and it a great metaphor for the rest of the movie . not exactly action pack but still silly enough to provide a few chuckle to bad movie aficionado but probably of no interest to others . by the way and in one scene late in the movie and the sheriff and another local jump into the lead man jalopy . a they pull out and the shadow of the boom microphone be very clearly see in the foreground . consider the low budget and low expectation for this film and it not too surprising that they do not edit this out or re shoot the scene .