Something magical happens to iced coffee when you shake it with whiskey and maple syrup: You get a lovely, creamy head of foam on top — almost like a Guinness — that disguises the dark depths below (which contain enough caffeine to power any nocturnal superhero).
Found in a list of Batman Themed Cocktails @ http://www.drinklab.org/batman-drinks/
General Instructions for The Bruce Wayne Cocktail
Brew a pot of coffee and let chill until cold, or dilute cold-brew coffee concentrate with an equal amount of cold water. Measure all ingredients into a cocktail shaker filled with ice and shake thoroughly, until chilled and foamy. Strain into glass over ice.