Here's a question worth considering: Did you ever jump into the Chesapeake Bay in the middle of winter?
If so, you have probably taken the Polar Bear Plunge. My scout troop and I did it as fundraiser for the Special Olympics.
Warning: If they are not used to the cold, it might put most Earthlings into shock, and their toes would freeze off.
Half of me wanted to go in deeper. Half of me wanted to not have gone at all. That second one was probably the bottom half.