I have two from when I was a kid. Once I was waiting at a traffic light with my mom. The light turns green and I jump out onto a street without looking. Not even half a second later a car whizzes by just centimeters in front of me. It went by so fast I have no doubt it would have killed me had it hit. That was probably 20 years ago and I still always look both ways even when the light is green.
Another one was at the beach. I couldn't swim (still can't) so I was walking parallel to the shore in water up to my shoulders. At one point there was a drainage pipe or something and the current from it seems to have eroded the bottom, so as I'm walking the ground suddenly goes out from under me and I feel like I'm getting pulled deeper in the sea. Luckily my mom was nearby and pulled me out pretty quickly. I don't like going deeper than waist height into the sea since then.
I also had a more recent scary moment, which wasn't really near death, but could have easily been very bad if there was an oncoming car. Get good tyres and don't fuck around in the rain, kids: https://www.youtube.com/watch?v=VXTThHtUqLk