We went to the Wisconsin Dells way back in early May (and didn't know about the Three Wolf Moon shirt) . The Dells are home to gorgeous upper-midwestern scenery, excessively fun waterpark hotels, and tourist trap souvenir shops. This shop was near the Ripley's Believe It or Not! museum, which we had just visited for laughs. We found several other versions of this shirt. Our favorite was one we called "Purple Wolves in Love":
These are all extremely elaborate designs for t-shirts. They are all quite um.. distinctive. Please note, I know the plural of deer is not "deers". It was just a slip of the tongue.
Also: This article at the Onion seems relevant: CLICK HERE.