That volunteer at the dig site who pointed out a flake I overlooked
I was sifting through some dirt at a local field school outside Santa Fe about 2 years ago, nothing fancy just a weekend thing. An older guy, probably in his 70s, came over and grabbed a tiny piece of rock from my screen, said 'look closer, that's a pressure flake, not a random chip.' He showed me the bulb of percussion on it under a hand lens, and I couldn't unsee it after that. Has anyone else had a random stranger totally shift how you see something ordinary out in the field?