Subway currently has a Scrabble game going where you have to go to their website to enter your game pieces and play. When you click on Play Now, you get DENIED if you are using Firefox on Linux. They send you to a page telling you:

The following problems have been detected:

You require a browser compatible with either Internet Explorer, Netscape, Firefox, Safari or Opera.

If you use User Agent Switcher and change to Opera 9.2 (Windows Vista), the page renders fine. Clearly, they are discriminating against Linux!