Annoying ad

I noticed when I went to IMDB, the most annoying ad in the world came up. Every time I found a new movie, these two giant metal arms would appear on the screen and shake my browser for 10 seconds or so. It would be followed by an ad for I, Robot (I refuse to link to it, both because of the ad and because it looks like it will be a travesty.) Why do advertisers do this? Don't they know it just annoys the hell out of us? There should be some reforms in Internet advertising. It's not getting them anywhere.