Fill two or more shooter 1 oz. shooter glasses with the kahlua and vodka and place a slice of orange on the top of each glass. Put the Sambuca in a wine glass and light. Pour the lit Sambuca on the shooters below and let burn for a short time in front of your bedazzled guests. Blow out the fire and instruct the drinkers of the shooters to drink out of the glass first and chew the Sambuca-soaked orange slice last.