Clue seems to have become more known over time, but I agree it still belongs on this list. I remember when it came out. They really hyped the angle that you could see one of three different endings depending on which theater you went to. The newspaper ads put an A, B, or C next to each theater to indicate which ending that theater was showing. I lived in Orange County, California at the time so there were dozens of theaters in easy driving distance. I'm not sure how this worked in small towns.

Anyway, I remember thinking the idea was quite clever and people were talking about it and... the reviews were mediocre and the movie developed almost no word of mouth and the air just went out of the balloon. My girlfriend and I decided to give it a miss and a few weeks later it was gone.

I really don't understand why. A friend and I rented it on VHS a year or two later and thought it was hilarious. Just a very witty well-constructed film, easily the equal of Murder by Death, the most obvious movie to compare it to.