Do you ever rearrange books at bookstores?

I went to Barnes & Noble over the weekend, and found one section in such array that I couldn’t find my book. The messiness was so distracting that I couldn’t even search for it through each and every book. So I rearranged the shelves, putting them in order. I didn’t even really alphabetize them, just put all copies of books or by one author or a set together. After about half an hour, I realized this may not be normal… And then continued to do it for another half an hour. Do you do this, too, or is it just me?