The undergrads set up a dunk tank on Monday. It was approximately 40 degrees outside. I am pretty sure the tank was filled with cold tap water, given the facial and body language of this poor girl after she was dunked (no photo, sorry).
For perspective, Minneapolis winter tap water is sometimes uncomfortably cold for drinking.
The posters advertising this event promised professors for the dunk tank, but I didn't see any.
Project 100, #72.