Jägermeister

From Frikipedia

First and most importantly, don't.

Jaegermeister/Jägermeister is the devil's bile, and should never be consumed. If, however, you are foolish enough to do so on a school night, make sure it is well chilled and in the form of a Jägerbomb.

Alternatively, for a tastier and less painful treat, squeeze the juice from your own eyeballs and mix generously with sulphuric acid.