Take a trip on the nostalgia express with this officially licensed Stranger Things TV Heat Change Mug This mug is styled after a classic 1980s, TV ( es, they used to be big and bulky) and can hold up to 500ml. The front features a heat-sensitive element. When your favourite hot drink is added a Demogorgon appears on the screen… spooky! Perfect for any fan of Stranger Things, or just cool novelty mugs… and who isn't. Time to stick the kettle on.