If you don't work at Dell, and even if you do, this is pretty amusing. A marketing video for the Dell XPS 15 laptop went up on Dell's YouTube page recently. Sounds innocent enough, but if you play close attention to the video, you'll note that the XPS 15 is actually running OS X. Guess the marketing folks forgot just who they were working for.
Here's a shot of the laptop.
You can even tell here that it's running OS X. But when they zoom in for a closer shot, it's even more blatantly obvious.
Check out the full video over here at The Verge.