Shark! Heat Changing Mug - Add Coffee or Tea and Sharks Lurking Under the Water Appear - Comes in a Fun Gift Box Pour in hot water and watch the ocean get a little nippy. A beautiful day at the beach turns terrifying right before your eyes. Go on. Don't be scared. 12 oz. ceramic mug. Comes in a colorful box. Color changing cups are microwave safe, but not dishwasher safe. Hand wash only. Don't soak. Click on "The Unemployed Philosophers Guild" above the product title to see more great gifts. UPG truly has presents of mind.