Apparently, fish pedicures (having fish nibble dead skin off your feet) are all the rage in beauty treatment:
Customer Patsy Fisher, 42, of Crofton, Maryland, admitted she was nervous as she prepared for her first fish pedicure. But her apprehension dissolved into laughter after she put her feet in the tank and the fish swarmed to her toes.
"It's a little ticklish, actually," she said.
Ho said the hot water in which the fish thrive doesn't support much plant or aquatic life, so they learned to feed on whatever food sources were available -- including dead, flaking skin. They leave live skin alone because, without teeth, they can't bite it off.
http://www.cnn.com/2008/LIVING/homestyle/07/21/fish.pedicure.ap/index.html - via Cute Overload, thanks zazie!