A lady on the beach telling me my detector was bothering her dog. I think she thought it was emitting frequencies or something that "only dogs hear" ?
Another time a buddy and I were detecting at a rural country yard's home, where a stage stop had once stood. We were standing/hunting inside a picket fence, on the interior of the yard. A truck pulled over to the side of the road, on the other side of the fence, and the guy motioned for me to come over. So I took off my headphones, and approached the fence to see what it was he wanted. The following conversation then took place:
Him: "Can you guys come do that at my place when you're done here?"
Me: "Sure, where's your place at?"
Him: "down the road about a mile. How much do you guys charge?"
Me: "We don't charge anything. We just do this for fun. How old is your house?"
Him, with a quizzical look: "Uh... my house was built in 1955, but I would insist on paying you guys"
Me: "uh ... we usually only hunt yards of older homes. 1955 is not too old. And ... no, we don't charge, we just enjoy doing this"
This back and forth conversation continued another minute, and he just couldn't fathom why we were going to do it for free, and couldn't understand what the heck his age of his house had to do with ANYTHING. Nor could I fathom why a perfect stranger was inviting me to come detect at their yard, and whether or not I was going to make time for a yard that wasn't that old. Until ... it finally occurred to both of us .... that he thought we were weed-wacking! Doh!