About the microwave
A previous reviewer stated that there is a picture (sic) of a microwave on the bottom so he put it in a microwave and experienced a change in mug shape and function. I believe the icon is of a dishwasher, not a microwave. The product label says it's dishwasher safe and says nothing about a microwave.
I know people must think "it's a cup, why do I need to read the directions?" Well, um...