Octaman (1971)
I haven't see a movie as good as "Octaman" in ages. Radiation produces a hideous half man/half octopus that attacks a caravan, kills a couple of scientists and runs off with the leading lady. Gloriously awful in all respects with one the most hilarious monsters ever. The Octaman costume (designed by Rick Baker) is a guilty pleasure to be sure but the guy who wore it had no idea. When he wasn't flopping his tentacles around trying to hit people he sat in a pond looking suspiciously like someone having a sneaky piss in a swimming pool.