This thread reminds me of something I once witnessed in a supermarket.
The old lady in front of me in the queue was a bit doddery and asked the till assistant to count out the right money from her purse, tipping a few coins into the assistant's hand. Among the coins was a small, grey-yellowish object. "Oh, that's my lucky tooth!" said the old lady, plucking it from the shop assistant's hand.
The look on the shop assistant's face was quite something -- I thought she might be about to pass out, or throw up...