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Also make sure if you back flop into the snow, that it's fluffy and deep. One year Mrs. B. decided to do the Nestea plunge backflop into the snow. She didn't realize that the snow had partially melted and refroze into a nice solid block. She basically backflopped onto a sheet of ice. She was unhurt and would probably have been embarassed, but I was the only witness- and I knew better than to laugh (once I knew she was OK, of course).
Also take note that when you do flop and roll, if you haven't done it before the plunge back in the tub can be bitter sweet. I personaly think the tingling feeling when you first get back in the tub is your pours saying ahhhhhh, but it can hurt if your not expecting it.