FOND DU LAC – Another warning against what's known as the "cold water challenge."
The Fond du Lac Fire Department says a teenage girl will need surgery after she jumped in Lake Winnebago last week.
The girl got deep cuts on her leg when she landed in a bed of zebra mussel shells.
Firefighters say she's lucky she didn't hurt herself more.
We showed you a few weeks ago the damage the cold water can do.
The idea is to jump in cold water, and then nominate on social media three more people to do the same.