With all the crazy heat we have been having, people are looking for ways to stay cooler. It may sound counter productive, but to cool off quick you should take a sip of a hot beverage.
Your body regulates itself when it gets too hot by sweating and it gets those signals from thermosensors that are located all over your body. If you take a sip of a hot beverage, it will signal the thermosensors in your stomach that you are too hot and will make your body to sweat. Just make sure you are actually sweating before you take your sip or it will not work.