Oh I've had a couple, nothing that gets my life to flash before my eyes though. Infact I almost died yesterday. I fell off my bike when crossing the icy road and hit my head. Good job that cars go slow when roads are icy, otherwise I might have got much worse injuries.
Also, I saw my friend get hit by a car. Sports car going miles over the speed limit, knocked him off his bike, and his head hit the window, smashing it as he bounced off, then landed on the road. He managed to get up, his entire forehead covered in glass and blood, limped to the driver, apologised, and collapsed. Was quite a horrific sight.