Bumping into a friend in a large city

I think this is the only coincidence that's stuck with me - it was about ten years ago, and I was in London for the day, planning to do a few things before meeting up with a friend of mine in the evening to go to a gig. It turned out that my friend had also headed into London a few hours early, and we bumped into each other on (I think) Oxford Street - I saw her crossing the road and called out. This wasn't near any shops or venues that both of us were interested in, we were both just passing through the city and happened to cross paths. (Bit concerned that by publishing all the stories visibly at the bottom of this page, you're discouraging people from reporting mundane coincidences - I nearly stopped and deleted this one, after reading the more epic coincidences below.)