QR Codes

I have been reading a lot about QR Codes from Jeff Utecht's blog The Thinking Stick. I have taken his QR Code Challenge and hung a QR Code outside my classroom and am waiting for a student to figure out how to read it. I hung it outside my room one day after school and the very next morning it was causing quite a bit of buzz in the hallways...what is that black square thing?...some students even knew what it was, but still haven't figured out how to read it. They just said it was something that you read with a phone. I can't wait until they figure it out!