Advertisers abused the hell out of us back in the early days of the Internet and we haven't forgotten. Multiple Pop-ups, pop-unders and seizure-inducing banner ads.
If they simply stuck with small, basic, non-flashing banners, I could have handled it. But greed knows no limits with advertisers.
"Butters! Are you looking at 3D gravitational hyperbolic topography?"
"No Dad! Just looking at porn!"