University of Phoenix Stadium

Here's what looks like the world's easiest sports trivia question:

What football team plays its home games at University of Phoenix Stadium?

The answer, of course, is the NFL's Arizona Cardinals. Huh? Yes, that's right, it's not the University of Phoenix. The University of Phoenix is a for-profit university specializing in adult education, and has no intercollegiate athletics program. They bought the naming rights to the Cardinals' new stadium shortly after it opened in 2006, just like corporations like FedEx and Qualcomm do. Weird.

Another odd thing about this stadium is that it has a retractable grass playing surface, the first stadium in the country to do so. This lets them keep the natural grass in the sun more and host other events without damaging the turf.