I love it when people say "Huh? Porn site? Wow, I'm shocked! I'd NEVER visit a porn site! That crrraaaaazyyy internet, always magically obtaining my name, e-mail address, and checking account/credit card information out of thin air and making embarrassing purchases on my behalf! Must be one of those viruses or spyware you hear so much about! By the way, how do you clear out that list of websites you visited lately? It's..umm..annoying to see all those...umm...news sites I visited over the past few days, you know."
I used to hear shit like that all the time when I did tech support for an ISP. It was refreshing when I'd actually get calls from people who were honest and said "Hey, I can't get <porn site> to show up, what's wrong?" or "How do I clear the porn sites out of my browser so they don't pop up in the list that drops down?"