|Melt butter in a medium saucepan over medium heat. While the butter is melting, slice the bananas. When the butter is melted, add the brown sugar and cinnamon and stir to dissolve the sugar. When the mixture is bubbling at the edges, add the bananas and stir to coat. Let the bananas cook in the syrup for a minute then remove them from the pan. Add the rum and carefully light the rum on fire by using a matchstick at least 10 to 12 inches long. Make sure your face is not anywhere near the pan. The fire will burn for about 2 minutes. After the fire burns out, stir the sauce and use as syrup for the waffles.