Pour coffee into warmed mug. Float 2 teaspoons brandy on coffee. Put remaining 2 teaspoons brandy into a tablespoon with sugar cube. Warm spoon over hot coffee. With a match, carefully ignite brandy in teaspoon. Slowly lower spoon into coffee to ignite floating brandy. Wait 1 minute after flame has died before drinking.
From Sheila Buff & Judi Olstein, "The New Guide to Mixer's Low-Alcohol to Nonalcoholic Drinks." Published By HPbooks, Inc., 1986, Isbn 0-89586-458-4.