Yesterday, Lifehacker posted an April Fools QR Code Internet Scavenger Hunt - the point is to find and decode a series of QR codes hidden on various websites. But the trick is that you not only need to decipher the clues, but use reference skills to search and find the right websites.
It was fun, and the information provided in the clues is remarkably similar to library reference transactions - cryptic and obscure, but usually enough to go on.
So test out your reference skills - it's fun. It's also a very good example of how a library can use QR codes for an enjoyable and engaging project.
It would have also been interesting to sort of track peoples' search techniques and strategies, to see if librarians are any better at something like this than anyone else.
The article also linked to a handy online QR code decoder - neat.