Ludicrous anecdote via half-a-movie review, I went and saw Hard Candy last night, which contains a certain infamous scene which some of you may have heard of and some of you may not have (I certainly had, so it's not like it was the suprise factor that got me).
I actually got through the scene okay. (annoyingly, I needed to go to the bathroom before the scene started, but I didn't want to give the impression I was running away from the scene, so I held on) There were some giggles from the girls in the audience at the pained expressions on all the men's faces, and I do believe I had a finger or two in my mouth as it was all going on, but the whole scene was implicit, they didn't show anything gross, and I didn't feel funny until after it was over. Then I felt a bit nauseous, and so I thought I'd stand up- maybe to get some air, maybe to go to the bathroom.
Then I fainted.
I don't remember standing up, or even falling down. It was actually highly disorienting, the first thing I remember was not knowing where I was or what time it was, I was just lying on the floor in the dark with lots of people crowding around me, and I felt very sick. As it turns out only a few seconds had passed, but I didn't realize it at the time so I was actually a bit frightened as I'd no idea what had happened.
Anyway I was ushered out of the theatre and after a minute of deep breaths and a cup of water I felt pretty much normal again- if a little embarrassed at passing out in a movie. The staff at the cinema were really nice about it, they refunded our tickets and were offering drinks and things (so big ups to Vue cinema in the West End), but I was a little annoyed because I never got to see what happened next, and now I don't know how the movie ends.
If anyone with a stronger stomach than me can outline how it all worked out in the comments, I'd really appreciate it.

Does this mean you're a wuss?
Haven't seen the film. Was it good up until the moment you fainted? :-)
You should listen to Mark Kermode's podcasts on it. He recommends all girls take their boyfriends to it ...
Matt: yes, this is solid proof I am a wuss. The movie was okay (if uncomfortable) leading up to the scene. The acting was certainly top notch.
that's no good mate! have you ever fainted before? if it's any consolation i nearly fainted after giving blood once. I stupidly went home and had a hot bath and felt all woosy. well i don't know if i'd want to see the film now!
Don't worry Jayne, this was a very guy-specific kind of faint.
LOL @ Guy-specific!
(I come here by way of Rockit.)