An embarrassing moment

I got a call from an old acquaintance and we were talking about rock piles when he mentioned there being some on a hill nearby that I explored at least once in the past, without finding anything. How many times have my eyes passed across that same hill on the topo map and discounted it because I had "already explored it." And what about those low areas between the hill and the nearby brook! I discounted them for some other reason. And now to have him tell me about the piles that are in there too is embarrassing.