In a medium nonstick skillet over medium high heat. Add 2 tablespoons butter. When butter melts, add bananas and saute for 3 minutes.
Sprinkle with brown sugar to coat bananas. When sugar melts around bananas, add rum and flame it. When flame goes out and alcohol has evaporated, spoon warm bananas into cocktail glasses. Top with small scoops of vanilla ice cream and serve.