Ditto on what Nock Nock reported. Tough shows are a thing. I have dug clams for 55 years . Three or four years or so I was having a tough time while some others were tearing it up in the same area. I approached an elderly lady and asked her what I was missing. She said that if you think you saw a show, dig it. She was absolutely correct. Clam shows that disappeared in one blink of the eye. As I pounded the sand they were nothing but a flash. It was like you were imagining you saw them but did not trust your eyes. There was a lot of those Thursday and Friday !