A bunch.
Two while snowboarding. First time I hit some rocks that were hidden in fresh snow. When I checked my helmet, a rock had pierced it in the back of my head. It was easily a fatal hit had I not had my helmet on. The second time I accidentally rode off a cliff (took the wrong line). I landed on my back in powder but a snapped branch was sticking up two inches below my left arm pit. Had I fallen four inches to the left, it would have impaled me through the heart.
I lost count how many while surfing. Lost a surfer I was trying to rescue and almost drowned myself.
Oddly, never while downhill skateboard racing.
Twice while riding a motorcycle.
Once in a car. A pickup hydroplaned on the interstate right ahead of me. It went in the ditch, overcorrected and came right at my door at speed. I turned my wheel into it so it wouldn't t-bone me but instead I missed it entirely and all I got was mud on my car and in my underware.
Blockage in three of my four main heart arteries. Two were 99% blocked. It required four emergency stents in my heart. I should be dead for sure from that one but a little voice in my head told me to skip the boat trip and go to the ER because I felt "funny".
Stage 3 cancer. Beat it but lost my singing voice. Fuck cancer.