I was flagged down by a couple of likely looking young flibbetygibbets in hoodies recently - turned out, rather than attempting to thrash me and have away with my bike, they just wanted to borrow my pump. I ended up spending 15 mins or so fixing a puncture for one of them, then watching enviously as he pulled off effortless coaster wheelies, endo's and stoppies. Nice lads, if a bit rough round the edges.
Bren