I once actually hit a couple at it in Crowthorne Woods, left tyre marks in the guys leg!
Stumbled into a rave at Swinley, with the DJ set up under the bridge and as i ride down a steepish slope was faced with a tent across the trail and took the guy ropes with me, 2 blokes still off their faces chased me.
Dog shrine off Tunnel Hill on the ranges, a tree covered with photos of a dog, its leads pinned on there and some dog based poetry.
When i rode around Liverpool Street/ Moorgate in London in 2001/2002 used to see a guy in a 3 piece pinstripe suit, bowler hat, briefcase and brolly under his arm on a unicycle.