Here's one I was just reminded of. This is the most disgusting thing I've seen on a train.
Chiltern train from Leamington to Birmingham Moor St. Sat round a table. Young man next to me, older woman directly opposite me. The guy had earphones in but you couldn't hear it (and it wasn't a quiet coach anyway). The woman was sending a text on her BlackBerry, and I know it was rude to do so, but I did glimpse the second half of what she was writing on the screen. Something very similar to this:
"...opposite some chavvy black kid pumping sh*t loud music through his headphones. Bet he hasn't got a ticket either."
Now I couldn't hear the music and I was only a foot away from it, so how she could hear it sitting diagonally opposite him is a mystery. Also there was nothing remotely 'chavvy' about his appearance, and he wasn't a kid either, clearly a student probably about 20 years old. In fact there seemed to be nothing to substantiate any of the bilious garbage in this woman's text other than the colour of the guy's skin.
I think you'll agree that's pretty stomach-churningly disgusting.
I could have confronted her, but that would involve admitting I was reading her texts and also I'm surprisingly bad at putting my point across in those sorts of situations. My action was far more ingenious. I tapped the guy on the shoulder and then briefly kissed him on the lips. (For he was, of course, my then boyfriend.) I kept one eye on the woman to watch her tiny stupid bigoted mind explode at the concept of an interracial same-sex relationship. She tried to hide it but the horror really showed on her face.
And the icing on top of the cake of epic ownage I had just served this woman was that at the same moment the guard came to check our tickets and railcards, which we both had of course, and he had that smile on his face reserved for two people clearly in love.
Victory against the bigots.
(Unfortunately I bet if you asked the woman what the most disgusting thing she ever saw on a train she'd probably say "I once sat opposite a white boy and a black boy who were snogging each other's throats out the whole journey. Hands on arses and all. Makes you sick, doesn't it. Also the black one's trousers were so low you could see his bumline."
)