It's no secret that I'm a huge fan of Universal's THE CREATURE FROM THE BLACK LAGOON. The character is wholly unique in a pantheon filled with psychos, supernatural beings, and atomic mutations. Creatch is simply a living survivor of the Devonian age, left alone in his Black Lagoon until he is disturbed by a team of scientists.
There have been a number of over-the-head Halloween masks devoted to The Creature. This one, by Reel Creature, is particularly well done. It retails for $299.