Is Your Mug Warm or Are You Just Happy to See Me?
When I was in grade school we got these T-shirts on one of our weekend trips to Traverse City that changed color based on the temperature of the room. I wore that shirt all the incessantly. In retrospect, while the concept may have been wildly innovative, they were incredibly cheesy (score 1 for the '90s).
While these mugs may rely on some of the same technologies as my color changing t-shirt, they are in no way whatsoever cheesy. They are awesome.
Visit thinkgeek.com for these gems and other amazing stocking stuffers.