A 16 year old Australian took a dip in the ocean and came out with his feet covered in little bugs that were chewing his feet, via CBS News:

A teenager who just wanted to relax his legs at a Melbourne beach but emerged with his feet covered in blood has stumped marine experts, but one biologist is convinced the culprits were tiny scavengers.

Sam Kanizay's legs felt sore after playing a game of football on Saturday, so he decided to soak them at the beach. About 30 minutes later, the 16-year-old walked out of the water with his feet and ankles covered in what looked like hundreds of little pin holes that were bleeding profusely. Upon returning home, his parents promptly took him to the hospital.

The kid's dad went back to the beach and captured some of the "sea fleas."  He then put meat in the water and the fleas devoured it.