Flaming the absinthe is a delightful tradition in my home.  It brings out my inner pyromaniac and it scares the children into silence.  Pour absinthe over a sugar cube balanced on a slotted spoon (or fork).  Light the sugar cube.  The flames will eventually ignite the contents in the glass as well.  When you've tired of this, pour iced water to douse the flames.  Drink deeply. Try not to cut off your ear afterwards.