I made homemade Absinthe once, from some kit I bought over the internet. My legs got a little numb, but that was probably from the vodka. It was like 40 percent alcohol. That shit was fucking bitter. I bought it from this guy.

http://www.deadflesh.org/fear/absinthe.html

P.S. I made that shit like 5 years ago. So I don't know if he's still reliable.