[Skulhedface]

I don't know if it counts as painful, but it sure was excruciating, and I think psychological pain counts...

When I was 8, we went to Galveston Beach and were in the water on an inflatable raft. I fell out and couldn't find my way up too quickly but when I did I came up and got stuck under the raft for about two minutes. Not being able to breathe at all for two minutes was very painful.