The Horror!? 44: Attack of the Giant Leeches (1959)

AotGL is an archetypal specimen of late Fifties Roger & Gene Corman co-productions. So it is a strange mixture of the merely competent, the amateurishly incompetent and the surprisingly effective. "Merely competent" is the direction by future TV director Bernard L. Kowalski, and the script. Obviously scriptwriter Leo Gordon had a grip on concepts like theme and character, a less good grip on the concept of dialogue and no idea what plotting is supposed to mean at all.
"Surprisingly effective" is some of the acting (the part that doesn't fall under the description of "amateurishly incompetent"), some moments of actual suspense and some quite creepy scenes. Letting the monsters keep their victims alive to suck them dry over some time is a gruesome and effective touch, for example.
The "amateurishly incompetent" part of the movie lies in the nonsensical and baffling cutting. I dare anyone to try and explain what happens in the action scenes at the end. And then there are the monster costumes...
Did you know that leeches have arms, eyes and suction cups like an octopus has all over their bodies? Or that they wear air tanks under their skin? Well, the special effects crew (if you want to call them that) did.
But there are worse ways to waste an hour than with Giant Leeches.