[Shrub]

Actually, this was mildly popular with teams a few weeks before MN State Champs, but it was just a cold water challenge with no donation whatsoever if I remember correctly. Teams here just went to the lake and freezed their butts off (which of course raised health issues because the water was way, way too cold to be swimming in) and after a while there were police officers (rumour has it) patrolling the local lakes and warning people against doing it.
It was pretty silly, and our team never did it as a whole even when we were supposed to (although people on our team did anyway, including me. I got kinda sick). It's better to put your effort into actually educating yourself on why you were told to go jump in a lake than jumping in the lake yourself and getting sick (summer colds = bad).