When I did tableside service, MANY years ago, we made Cafe Diablo. Done tableside with a guerridon and a rechaud. Have the busboy bring you 2 double espressos. In a pan on the rechaud, put the coffee and the whole orange and whole lemon peel. Heat for 30 seconds. With fork, take the end of the orange peel and lift it over the pan. Pour the Cognac down the peel, tipping the pan to ignite it. Do the same with the lemon peel, but pour Grand Marnier down it, also trying to ignite it. Provid lots of sugar. Once when I was doing this, the woman at the next table said : "Ooh look, honey, he's cooking rattlesnake!!".