In the bottom 1/3 of a tumbler*, combine equal parts bourbon and crushed ice with 1 tablespoon of simple syrup** and a crushed mint leaf. Pack the tumbler to the top with crushed ice. Pour more bourbon over the ice to fill the glass. Do not stir. Garnish with a sprig of mint. Serve with a straw cut to size. (Warn your guests not to stir. That sugar water is about the best thing this drink has going for it until you get to the conversation at the end.)
*Use a reasonably sized tumbler. Much more than 8 oz. might easily overserve you!
**I make simple syrup by combining 1 tablespoon of sugar with 3 tablespoons of warm water. Yes, it's that simple.
Serve with cocktail napkins.