WIRED ScienceSpill-Proof Cups Aren’t Magic. They’re Physics!
They call it the Mighty Mug-and the idea is that it isn't easily knocked over. Of course, you can tip just about anything over if you try hard enough. But really, how does this work? Let me be clear: I haven't actually played with a Mighty Mug-so most of this is just physics-based speculation. It seems the key component of this mug is some type of suction cup on the bottom. When you put the cup down, a rubber seal forms with a smooth table surface.
