Bud Abbott and Lou Costello Meet the Invisible Man (1951)

Certainly one of the best in the series.

Our intrepid bumbling duo deliver the goods in one of the better offerings on their considerable CV. Here they are freshly qualified Private Investigators thrust into a murder investigation with an invisible man. That alone should tell you that the fun flows at a very decent clip, so with that I just need to say that some of the sequences here are comedy gold. Like a scene at a restaurant that is excellent, or Costello pretending to work the ball in the gym, and a final reel of a boxing match that really gets the laughter flowing. Watching these guys act as if with a real invisible man is wonderful, and of course the effects team also deserve praise for doing such a damn fine job with the invisible man of the piece.

Not quite as good as...Meet Frankenstein, but it's darn near close. 8/10