Interesting question. I am a complete fainter. I pass out almost every time I go to the doctor. Funny how I want to go into the medical field
My first time at the chiropractor I was getting all the tests done to see what was wrong with me. Nothing was wrong. I was totally fine, then he started doing this slidey thing to my spine and I started to feel like I was going to pass out, so he got me a cup of water. He began with the slide thing again and the next thing I know I'm laying on the floor drenched in water and super confused.
When I was maybe 6 or 7, my brother had ear tube surgery before school. I drove with him and my mom had this pamphlet about the tubes in the backseat, and as the voracious reader I am, I read the whole thing. Twenty minutes later, as I was waiting outside the school to be let in (I was sitting on a concrete bench surrounded by concrete), I passed out. I had to be taken to my doctor to get stitches in my chin.
I once passed out watching the movie The Thirteenth Year, the one where the guy turned into a mermaid when he turned 13.
*shrugs*