Just saw a pop over ad

I just saw a circular pop over ad asking me to participate in a questionnaire. Whilst I was trying to find the hotkeys to take a screenshot, the ad disappeared. The pages I went through to get it were:

1. http://www.theverge.com

2. http://www.theverge.com/2012/1/4/2680953/gaming-kotaku-joystiq-the-escapist-and-more-whoa

3. http://www.theverge.com/2012/1/4/2682154/how-i-arrived-at-my-new-home-vox-games

There was a banner ad for Ford Sync at the top of the page and may have been a square ad for Sync on the right. I can't get it to come up again. The Verge was the only tab I had open and it was my first visit to the site on this computer in several days.