A coffee-cup that has a band which expands to offer heat-protection for your fingers:
http://www.youtube.com/watch?v=2F9O8YV_36Q
http://www.youtube.com/watch?v=2F9O8YV_36Q
Quote:The Heatswell is an endothermic (heat-activated) coating for a paper coffee-cup. When that cup is filled with a tasty hot beverage, the band swells into a thick, insulating cloth-like material, offering both grip and heat-protection for your fingers. It’s thin, safe and cheaper than a cup and collar together. So what’s the problem? Take a look at the video. The Heatswell does indeed swell impressively, only it swells like a diseased tree-trunk blistering under napalm.