None of the examples hold a candle to the story of a certain Sir Henry Head dunking his penis in warm water, to test nerve damage and touch:
In the case of [Head], the tip happens to be devoid of heat-spots but is sensitive to cold and to pain. When... it was dipped into water at 40° C, no sensation of heat was produced, but [Head] experienced an unusually disagreeable sensation of pain... But, as soon as the water covered the corona without reaching the foreskin, both cold and pain disappeared, giving place to an exquisitely pleasant sensation of heat.
(Hat tip: Vaughan Bell)