Time and again someone puts a single roller into a bin, and then closes the bin door. What is the motivation for this? Are they testing to make sure the door will close? Well why not open it again once you're sure it will close?

I see this happen quite often. I can't tell if it's inexperienced flyers, or experienced flyers ("Maybe if I shut the bin, no one else will put their bag next to mine.").

Any ideas? Are you a closet "Bin-Closer?"