On the subject of over the shoulder, here's a little story:

Last year I was tricking a lot of people in my school to look at goatse. I told one friend the website and he went there at home. He didn't expect much at all, so he unknowingly went there with his dad standing right behind him. As soon as goatse loaded he realized I almost ruined his life. Luckily his dad didn't quite see it. We're still on very good terms, so all is good.