I got knocked off my bike about 20 years ago and was unconcious long enough that an ambulance had arrived.

I don't remember a thing between seeing the car pull out infront of me and waking up on the floor looking at the ambulance.

Same here, I flew head first down a ramp because I slammed the breakes too hard and the next thing I remember is people asking if anybody had a handkerchief or something, since my head was bleeding. A solid five minute blackout.