"Cycling" pop-in ad

I just had to completely close my IE browser (I know, I know... firefox, but I'm on a work PC and am basically stuck with IE here) because of the pop-in ad in the upper right of the forum pages. It cycled through at least a dozen different company's ads and the close button wasn't even displayed for any of them long enough to click it so it just kept cycling. At least I know I don't have epilepsy, because the flashing would have sent me into a fit if I did.

Has anyone else had this happen to them or am I the guinea pig?