I have 2.
On the Line - Lance Bass finds a pocketbook on the train, and falls in love with its owner based on the contents. An old girlfriend insisted that we watch it, figured it would be a good "romantic date" movie at least, and ended up begging her to put something, anything else in after about 1/2 hour. The first one she picked was George of the Jungle (I think she picked the stupidest movie she could so I'd break & put "her" movie back in.) I loved George.
Mary Shelly's Frankenstein - My fury with the flick built until DeNiro did Kano's fatality from Mortal Kombat on Tim Burton's wife. I stopped the cassette, went to my neighbor's house & gave it to him. I've never went back and watched the rest of it. I hope nothing awesome happened.