I used to do this thing when I was younger, I would take a plastic bottle of Pepsi, Coke, or whatever and I would pour a bit of the beverage into it and drink it like I was John Wayne downing shots at the local saloon.
In other words, knocking down a shot is cool; it looks good, feels right, and makes me feel like John Wayne dammit! However, what if you are not the whiskey, vodka, tequila type, what then you must be crying. We have you sorted thanks to the Beer/Shot glass that allows you to pour some beer into a shot sized well inside a beer sized glass and knock it back.
Or, you can turn it around and use it as a genuine beer glass and then when you are done with your beer, you can put some whiskey into the other end and down it. In fact, this second description is the actual use for the Beer/Shot Glass ($19), but we kind of like our plan too.