Creating a layered shot is easier than I expected. The key to the success is the steady hand, and a teaspoon. (And, of course, an idea of what can go into it.)
I pour the first layer straight into the shot glass. Carefully, since splashing liqueur on the walls of the glass makes for an ugly drink. All the layers after that, I pour on the back of a teaspoon inserted into the glass, just like that:
After that it is simple: tip the glass into my mouth, taste the stuff for few seconds, and gulp it down! The "tasting phase" is important (for me). The layered shots would loose much of their charm if I just quaff them like a medicine...