The number one function of a shot glass is to hold alcohol so you can get it into your mouth. Toasted marshmallow shot glasses sure look cute, but if they disintegrate en route to my lips, I will be less than amused. To see if any of these twee-arse vessels are worth your time, we made a whole bunch and tested them for leakiness, flavour contribution, and ease of assembly. We'll start with the best and work our way down to the failures.