The first time i went away with my inlaws (to the bahamas in 1997) I brought my detector. There i was, on the beach, and my father-in-law and both brother-in-laws were throwing change in front of me (which of course I picked up). They were laughing and joking and having a good time (which I pointedly ignored).
Then I got a hit, scooped up a very nice diamond ring, follwed about 2 mins later by a bracelet, and an empty pack of smokes with a $100 bill in it. I casually walked back to them, showed them the ring, bracelet, and $100 bucks... smiled and went back to detecting. They still harass me on occasion... and then ask what I've found.
oh... and as a bonus to this story, that night, I took my shiny new $100 bill, split it up into two $50s. I played blackjack for almost an hour on $50 until i lost it, then, put the other $50 on #7 on the roulette wheel (my birthday is 7/7/74)... and won $1,750. That was the BEST comeback line EVER
steve