My friend AJ was telling me last weekend about this person (she works with?) who won the Halloween costume party at her work... and he was dressed up as Aqua/Fish/Sea/Ocean Guy (see photo). From the picture you might not be able to see that there are real fish swimming around in the tank. Yep, it's filled with water and tons of fish are swimming in circles around him. How over the top is that?! Crazy! I guess he went to a few costume contests and won them all (which kind of takes the fun out of the costume) - but no denying that it is unique.
And then after looking at the photo a while I noticed the guy has a Camel-toe... so it makes the costume scary too!