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People who have really hot or really cold showers
Based on the limited observational evidence of people I have lived with, this seems to be a reasonable proxy measure of mental instability.
Are you a fan of maxed-out scalding hot showers or icy cold ones? Or do you prefer the "I'm normal me" option of somewhere in the middle?
If you are one of these people or know anyone who is, please call a researcher on 0891 505050.