Santa made a wrong turn somewhere around Minneapolis while trying to find his way home.
Actually, this is one of the members of the Missouri Disabled Water Ski Association. They do their thing in the Mississippi River under the Arch on New Year's Day. The members wear whatever one does for plunging into cold water. (And the water was cold yesterday. At least there was no ice floating in the river.) Personally I think they're nuts, although for a good cause.