Actually, I was on my way to a friend's house tonight (in the city) in another district, enjoying the ride on my Minelli quasi-mountain bike, when my gears caught and I heard an unusual sound from my chain that didn't sound like a good sound, and pretty much stopped me cold (but thank God it didn't happen when I was speeding downhill!). The chain had broken (a link came loose). First time that's happened to me. Maybe its because I'm undoing my chains now to properly clean them, and it weakens links, I'm not sure why this happened. But it meant having to walk the rest of the way, so.... I invented a new sport. "Curb surfing". It consisted of scraping my Crocs against the sidewalk the rest of the way, to help push the bike along. Where I couldn't use the curb to propel myself, I had lowered the seat and used the pavement directly, to push my foot along. It certainly wasn't biking, but it worked out a lot better than walking the rest of the way! I got there faster than I otherwise would have.
So.... if you see people biking "strangely", they have no chain on their chainring, and their seats are lower than you'd expect, and they're pushing themselves along the curb.... well, that's me that started that.