Doctor Who Disappearing TARDIS Coffee Mug - Add Hot Liquid and Watch The TARDIS Move From London to the Stars - Comes in a Fun Gift Box The iconic time machine / spacecraft sits in disguise on an English street. Add hot liquid, and it disappears, only to reappear in a far far away galaxy on the other side of the mug! 12 oz. mug. Heat changing mugs are microwave safe, but not dishwasher safe. Hand wash only. Don't soak. Comes in a colorful box. Click on "The Unemployed Philosophers Guild" near the product title to see more great gifts. UPG truly has presents of mind.