Take a shot glass.
Pour half part sambuca (I have Luxardo, I guess it's fine). Now you have a component with strong anise taste and a sweet bite as a whole.
Try to layer on top half part of Campari. For some reason (close densities maybe) they don't form a firm border and intermix kind of beautifully. Here you have a bitter punch.
The final taste is very confusing and the sweet and bitter don't really cancel out each other. The after-taste still haunts me, therefore I named it: Follia Italiana or Italian Madness. The only shooter that has puzzled me more so far was the Cement Mixer.