Sledgehammer (1983) David A. Prior

A young boy murders his mother and her lover with a hammer. Ten years later, a wave of teenage murders plagues the same area. 

 Man, does this gloriously ghastly shot-on-video micro-budget train wreck possess all the right wrong stuff to qualify as a real four star stinkeroonie: hopelessly all-thumbs (mis)direction, a droning and redundant hum'n'shiver synthesizer score, hilariously horrible acting from a lame no-name cast, ugly fuzzed cinematography complete with primitive fade outs, tacky freeze frames, and clumsy excessive overuse of strenuous slow motion, cheesy excessive gore, a meandering narrative that plods along at a gruelingly sluggish pace, the tried'n'true have sex and die cliché, zero tension or spooky atmosphere, annoying one-note characters, loads of needless filler (the ridiculous messy food fight set piece is especially extraneous), rusty tin-eared dialogue, dumb false scares, a downright surreal last third, and the inevitable "it ain't over yet!" sequel set-up non-ending. An uproariously atrocious howler.