Another vote for "Joe Versus the Volcano".
Add to it:
"Moment by Moment" - supposed to be a romantic drama, but they should've known better to try casting a love scene with John Travolta and....Lily Tomlin??? (Mike Tomlin would've brought more sex appeal to the role!) To demonstrate how bad that it was, I copied these review-gems from Wikipedia:
During filming of Moment by Moment, a Los Angeles magazine reported from the set at the time: "The chemistry between Tomlin and Travolta began to rival that between Menachem Begin and Yassar Arafat." A crew staff was also quoted saying: "Two weeks into the shooting on location in Malibu, there was nobody on the set that didn't know we were in the middle of a turkey. It was like being on the voyage of the damned."
Two years after its release, Lily Tomlin said of the experience: "John and I were totally unprepared. We thought it was a sweet, small, lightly funny movie. We were not prepared for what others thought. It's the one thing that all performers live in fear of - total failure. And when it happens and you survive, I think you're probably in a much better place. It's made me less cautious. It made me place more importance on the experience of working with other artists than on the reaction of critics or the public."
"Death Race 2000" - a satirical movie that missed its mark. David Carradine & Sly Stallone mis-calculated this one badly. We walked-out early.
"Godfather III" - if only for the horrific casting. Having Sofia Coppola playing in the role that called for an Italian beauty was a terrible, terrible decision - and it successfully killed her acting career - what little career there was anyway. I'm a Godfather movie fanatic, but her role in the movie - by itself - ruined "Godfather III" for me.