Haha, to bring in another psychology principle, after watching that I watched it again with my eyes closed. Definitely does not sound like Chewbacca unless you have the visual of Chewbacca in your mind making it easy for my mind to connect the memory of Chewbacca to aluminium dragging on a surface.
Hehe sure. However, both me and my colleague connected the sound without the visual. But we both saw one of the other Chewbacca videos a few days before so that's probably why. ;)
