Pshh, I thought this was about websites that are productivity wasters or cannot be unseen. That said, there was one time I went to a website that loaded a bunch of malware onto the computer at once, and I've suffered a couple of "infinite Internet Explorer windows" websites. Any prank "what's wrong with this picture" videos probably also qualify as life-ruiners because you feel like you're dying when you're paralyzed by the stare of the guy with no eyes.