When I was a kid, the church/school behind our house added a new church building and really nice parking lot which featured a nice, wide railroad tie staircase going down a hill. It was a wonderful thing to ride down that staircase on my bike.

When they were tearing up the old parking lot, there were lots of big potholes, but it was clear of cars and we could ride under stuff- it was a veritable 10 year old's bike playground. One hole caught my front tire at full speed- a friend said I went over and did a cartwheel with the bike. I just remember it being a big crash and running home crying.