As with any drink that has been around for a long time, Absinthe is steeped in history, tradition, and extreme headaches. Now that the licorice flavored herbal drink is legal in the US and we can expect a big rush for The Green Fairy, at least initially, it might be good to learn how to drink the stuff.
Wikihow has an article with everything you need to know about Absinthe. From how to select the right one (louche effect!), the different preparation methods for drinking it (glass in a glass for me), and how to not cut off your ear.
How to drink Absinthe
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