For those of us who love to read, there is something addictive about the book browsing experience itself. You develop a tendency to stockpile books. Even if you don't have the time to read a particular volume now, you tell yourself, you'll certainly find the time to read it later.
I spent some time in the IS department of a large company, and this gave me a permanent penchant for expressing abstract ideas in flow charts and IF/THEN statements.
The graphic below (which I found on Reddit) is a fairly accurate depiction of the way my brain works when I find myself in Barnes & Noble or Half Price Books.