Add the Bailey's irish cream to the bottom of a jigger. Then add the Tia Maria slowly. Now, carefully pour in the Absinthe over a spoon. The three liqueurs should be seperated in the glass.

Drink at your own risk:
Put the shot on fire and drink it with a straw, or you have another choice: When the shot is on fire you slap it to extinguish the fire and then you drink it.