gone fishing

I went fishing with an old friend a few years back and had another one of my, let's say "lack of thinking" incidents. We were on a state park lake that didn't allow boat motors and could fish as far as our trolling motor could take us. We were fishing close to the shore and noticed an old, small builing on the land not too far from the water. There was a wooden sign posted on the front. I read it and was a bit confused so I asked my friend, "what does that sign say"? He read it too and we were both baffled. Why would the sign read "Pain Shelter"? We caught several fish in that location and by the end of the day had decided to fish in the same spot the next day. When we returned to the boat dock, a couple of dock workers asked how we did fishing? We pointed in the direction and told them about the great spot out by the "Pain Shelter". They looked at us and said, "You mean "Rain Shelter" don't you"? My friend and I looked at each other stupidly and replied, "Yeah". The "R" on the sign had lost the piece that can easily change an "R" to a "P". We just couldn't put it together while fishing. We still laugh about it and probably all ways will.