Free coffee at Starbucks

In honor of Earth Day (a.k.a. deal day) Starbucks is offering a nice little incentive to bring your own reusable mug tomorrow.  When you do, they will fill it for you with brewed coffee or tea - hot or iced.

Here's the link to the details, the offer is good only on Friday 4/22.  Could be a dangerous day to have a Starbucks just a few blocks from my office.