I didn't like I Am Legend dispite the fact that I LOVE Will Smith and really, really wanted to like the movie. The ONLY redeemable aspect was his relationship with Sam. And it broke my heart to see the outcome.
My personal movie moment that makes me wish I'd never seen the movie was Fatal Attraction. That bunny scene did me in and I'd never CONSIDER watching it again.
Then again, I'm the nutto that roots for the Birds in "The Birds"...LOL.