On a dark Gotham night, the bright Batsignal stabs into the sky, summoning the Caped Crusader to action! Or does it? It's up to you, thanks to this temperature-sensitive mug whose decoration changes with what you pour in it. Hot beverages show one design, cold drinks another. Will you bring the Dark Knight running, or leave him in the shadows? It's your choice, Commissioner! Either way, pour yourself a drink. It's going to be a long night. Microwave safe. Holds 14 oz.