When I used to work in London I used to like cycling to and from work through the dangerous London streets, and I've only been knocked off once (by a maniac doing a right turn into me, thinking he could get into the junction before I cycled past it - having right of way).
I like mountain biking and have a Saracen Conquest dating from about the time someone first realised that adults might like a tough bike (1987). I'd previously knackered the spokes of a tourer as I took it over a golf course. I was jealous when kids got mountain bikes first, i.e. in the form of BMX bikes.