Looks like this:
The stylesheet that's the culprit is http://speed.pointroll.com/PointRoll/Media/Asset/Hyundai/202146/Centro_Hyundai_fonts.css?0.5043673429172486.
I'm seeing a Hyundai ad show up in both the 300x250 ad slot on the right and the 728x90 slot at the bottom of the page on various page loads.
I know that this is the kind of stuff that you guys might not ever see since ads are so tailored to cookies and browsing history, so I wanted to let you know about it. If there's anything else you need from me, let me know.