Today, March 22nd, is Talk Like William Shatner day because it is the birthday of both William Shatner and James T. Kirk. In honor of the event the folks at Think Geek have a Shatner Mask in PDF format they invite you to download for free, print out, wear in public, and take a picture to send them (work safe only, please). They have various Star Trek goodies they are giving away, you can see the prize list and the rules on that page.
