How old were you when you first crashed your bike into a tree and knocked yourself out and had to go to the hospital for a neck x-ray?

Fell off many times. Didn't have a big crash till I was 9. I was riding up the Thevenard Wharf with my Dad and two brothers. Dad was worried that one of my two bros would fall off if they kept racing so he told me to stay behind as he tried to keep up with them. He should have worried about me.
He looked ridiculous trying to keep balance on his bike. I laughed, lost control and ended up in the water.
The first face to look over was the kid Danny. The look on his face suggested he thought to see a dead body. The next face was Dad, who cracked up laughing. Danny gave him a different weird look and stepped away from him.
'Can you swim?' dad called.
'Yeah'
'Good, I'm not jumping in after you again! swim to the side and climb up.' 'let go of the bike and swim to side.' I didn't want to but it was dragging me down. Then from above 'is it cold down there?'
'Not when you get used to it' I called back.
I climbed out went home, had a bath, I was hyperthermic I think, It was -2 C that day. Got dressed and went with dad who had attached the rope from a crab net to a razorfish grabber thingy, and went and fished the bicycle out. At the area I had fallen in. I was very lucky I wasn't killed.