As this video from CurrentTV explains, most banner ads aren't all that dangerous — "provided you leave them alone and avoid eye-contact" — they're just bad inventory, senselessly inflating the third-party ad network bubble and pushing CPM prices to the bottom of the barrel by insuring supply outpaces marketer demand. But some breeds of banner ads are more dangerous yet — the motorskills test, the shaking ad and the celebrity-features quiz. Observe them in this video below, if you dare.

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