I was at the opening day of the Tour de France in Leeds -- what with its being my home town, there was that rather special aspect of one of the world's largest sporting events passing, almost literally, right outside my doorstep. And then there is the atmosphere, and in the TdF at least the various ride-past included a lot of stuff before and after the peloton. While that took a few seconds to pass, the whole procession before and after was well over an hour. Quite a lot to enjoy, apart from just feeling part of it all.
I expect that's a one-off for me, though. I'm not that into cycling, and it was just nice to be a part of it.