Making up for the lack of a complementary coaster, the mug even comes with it's own epic back story:
"It's Monday morning. You've been out rocking and rolling all weekend, and boy is your arm-cannon tired. You arrive at work in your robot dog, transform him into your desk chair, and settle into him to check a few news feeds to see if any killer roboviruses or random Russian scientists have tried to take over the world. Suddenly, your robot dogchairphone rings!
It's Boss Man, and the wily client just moved back the due date on your project -- to 20XX! (XX, we assume, is some value less than 10.) He wants the finished product on his desk by the end of the day, or he introduces you to Pink Slip Man. There's no time to lose!"
I think we've all found ourselves in a similar situation at one point or another...
You can purchase your very own E-Tank mug and read the rest of the story at ThinkGeek.
Thanks for the tip, Tony!