1 oz sambuca
1 oz tequila
2 - 3 dashes Tabasco® sauce

Pour the Sambuca into a brandy snifter and the tequila seperately into a rocks or old-fashioned glass. Add a couple dashes of Tabasco sauce to the glass with tequila. Roll the Sambuca around the snifter (like a cement mixer), ignite, and allow to burn for a second or two. Pour the Sambuca into the tequila rocks glass and cap it with the brandy snifter so as to extinguish the flames.

This should form some smoke within the glasses. Carefully lift the snifter and inhale the fumes, then pound the tequila and Sambuca mixture. Packs a pretty good wallop.