Put the kettle on?

Why do you feel hot - or cold?  If you think about it, it's because of the temperature differential between your body and the surrounding air.  If the air is hotter than your skin, you feel hot, and equally if the air is colder than your skin, you feel cold.  So if you're hot and want to cool down, you need to either reduce the temperature of the surrounding air (fans, air-con etc) or - and this seems completely counter-intuitive - increase the temperature of your body.  So, believe it or not,  a hot drink will cool you down!