Sam Kanizay is 16 years old and lives in Brighton, Australia.
Last weekend he cooled off in the ocean, which he has done before...but this was a different experience.
After being in the water for about a half hour, his legs felt numb and tingly. When he took them out of the water, his ankles were covered in blood.
His legs wouldn't stop bleeding so his dad took him to the hospital and when the staff couldn't figure out what was going on, Sam's dad, Jerrod, decided to try an experiment.
He took some raw steak down to the ocean with a net. When he took the net out of the water, he found these little bugs all over the meat.
Those would be sea fleas and that's what was thought to cause all the bleeding on Sam's legs.
If you want to see Sam's wounds, CLICK HERE, but I'm warning you, some of the images are pretty graphic.