I was out with my Sidewinder hunting a location that used to have a fairly old house on it. I hit a signal that wasn't too loud, so I knew it was under some dirt, but it made a washboard sound, kind of like a dit-dit-dit-dit-dit-dit sound real quick, I was thinking of a machine gun firing. I was pretty sure it wasn't something of value, but decided to dig it, just so I'd learn what it was. I dug it up and realized what it was matched the sound exactly. It was the reed plate from a harmonica, with all the reeds missing. I just thought it was funny that the sound was right on almost playing the holes (or non-holes) so to speak. I just thought it was cool that the sound was so descriptive, and that I decided to get more familiar with my Tesoro.