Funhouse. Hyped up by a lot of friends with nostalgia for it and when I finally got hold of one found the rule set kinda shallow with not much to do. Sold it in 3 months of buying it. I think to enjoy this game you had to be around when it was new.
Second would be 007 Goldeneye. Was bought because I needed money for a new car and had to trade down. I can't believe I traded my mint Twilight Zone for it but I needed the money at the time.