I've had three. One when I was 7 and I was eating a piece of meat and it was very tough to chew. I tend to swallow my food before chewing it up completely so I try to swallow it and I begin to choke. So I'm choking on this piece of meat and before I lost consiousness(however you spell it) I hit the ground, and I hit the ground so hard that I spit up the meat.
And the second one was when I was at a pool party and I jumped into the pool (very deep pool) and go straight to the bottom, I can't hold my breath for long so I need some air. I'm trying to swim up but can't swim fast enough so I open my mouth to breathe, inhaled a mess of water. And I was losing it, right when it seemed I was miles away from the surface I was pulled out by my friend. Two close calls, too much.
The third time was when I was 7. I taught myself how to swim so I'm not a strong swimmer. I was at Huntington Beach and it was high-tide, then I went out into the water. And I kept going further and further into the ocean, so this one wave knocks me flat on my face. I try to get up and am knocked down by another wave, then another. I was being pulled back and my fingers were digging into the sand to keep me from getting dragged out, that did nothing. Then there was this huge wave coming and I got up real quick and ran back to the sand. I was scared out of my mind.