Several years ago, I was catching the tube somewhere in Central London walked into a station and went to the far end of the platform as that was quietest part, although there weren't many people. Towards the far end was a tall man who looked around 50, as I past him he reacted and sort of "shoulder barged" me, not hard but there was contact when he moved I braced to be rugby tackled, there was no one else on that part of the platform and no need for us to be near one another. This lasted a fraction of a second and once passed him we ignored each other, waiting for the train another guy walked past him and he did the exact same thing. At that point I noticed he looked anxious and one of the lenses in his glasses was cracked, presumably from similar incidents that had not gone so smoothly? He was a "respectable" and normal looking middle aged guy, who I guess had some compulsive reaction to people (or men, at least) passing him, which would make living or being in London very difficult, though wouldn't be easy anywhere. I presume he was towards the far end to avoid people but he could have gone 20-30ft further along, maybe he had issues with that too.