Restricting it to movies that were supposed to be good (good casts, popular with some good reviews, etc.), and which others may like.
Contact - dreadful Jodie Foster/Matthew McConaghey space disaster (South Park had an episode where the mere mention of the movie induced vomiting - I applauded)
Ocean's 12 - just for the scene where it becomes a plot line that the Julia Roberts character looks like Julia Roberts. Loved 11, and 13 was a good bounce back.
Blair Witch Project - to be fair, it was a cheap indy and they probably never thought it would become a phenomenon. For that kind of hype, you expect it to deliver something other than seasickness.
Sports category: Jerry Maguire. Especially annoyed that Cuba Gooding gets knocked out cold, wakes up, and starts doing sophisticated end zone dances. The athletic trainers would have carted him off for precautionary reasons. At that point of the movie, I had had enough anyway.
The Last Boy Scout: Bruce Willis trying to be a Die Hard-type character with a terrible script. Movie starts with an NFL player pulling out a gun, shooting all the defenders on the way to the end zone, and shooting himself in the head. Started out awful, and went downhill. (Hudson Hawk was much maligned, but that one actually cracked me up).
