Obviously, there's the normal ones I use everyday like using olive or coconut oil for hair product or sexual lubricant, but my favorite has to be the french bread trick at Vons/Safeway. Y'see, Vons has bomb ass, fresh french bread and from 4-7pm, it's guaranteed to be piping hot or it's FREE. So, what I like to do is grab a hot loaf and stand around in the frozen aisle for 10 minutes "browsing" for ice cream. So, not only do I get to cool off from the heat, but I chill my hot bread which turns it into FREE bread. That's like two lifehacks in one. Do it.