Going through the "Witches Tunnel" when I was a kid, urban myth but when you are a kid it was scary, really really long tunnel that was just about the size to fit through and had a stream of water running through it, and the myth was that a witch cursed it when she died in there, there was a carving in the middle of it in the concrete and if you touched it, the witch would start chasing you through the tunnel, as it was in the middle, there was a hell of a long way till the end, the whole tunnel was about 250meters and you had to place one leg on one side of the tunnel and the other leg on the other side and sort of shuffle along as you couldnt run through the water.
We used to do this in the dark too
Another one
Almost falling out of the harness on a ride that went upside down and was high! If I had fallen out I wouldnt be alive today, I was a kid and far too young to sit in the seat/harness safely, I should never have been let on that ride. Given that when the ride got to the top and was upside down, it stayed there for 10-15 seconds!!