What’s in your background check?

I once ran a background check on myself. Hey, I don't always know where I've been. Most of it was fairly straightforward (previous addresses, phone numbers, tax records, etc.) but a few things arose that totally threw me. How did they know these things? For instance, they knew… …that I roll the toilet paper over, not under. …that I prefer boxers to briefs. …that I had favorited the History Channel, but never actually watched it. …that I know how to pick up an ice cube using only a piece of string and some salt. …that I know how to say…