When I was a kid, a couple friends and I were playing with our radio shack detectors. My buddy found a piece of steel that was bent over. When we un bent it, it had a couple old silver dimes, pennies and nickels inside. That is one of the coolest things I saw detecting. As for the coolest thing I found, that would be a tough call. However, I can narrow it down to a few items. I found an old high jump athletic metal that was really interesting. A few old watches over the years that I thought were cool. Of course jewelry is always a good find.