Absinthe is too damn strong imho + it gives me raging headaches ...
I prefer genepi a lot more, it's better tasting (less of that anise flavour ), and it's still strong but won't knock you out so fast :P
or a personal favorite because of the memories (or lack of memories) attached to it: Gnole
it's a french spirit very much like grappa and a friend of mine distils it himself. it tastes like cowdung but will knock you out before you know what's hitting you :P