Tequila and tea and the reason for shot glasses

The tequila and tea is an interesting mix, and I can see how the flavors of the Agave from the Tequila and the Tea would actually make for a great tasting cocktail (cold or warm). I've tried a Rum and Tea or a Rum and kind of hot cocoa mix that was pretty solid. So I can't imagine why this wouldn't be equally as good. However, that's not the main reason why I posted this up. Basically, Ralfy makes some pretty good head way into a brief history of the origin of shot glasses. He breaks it down pretty well, and I even learned something. Check it out below!