Whenever I'm at a book store and I'm standing in front of the shelves for a long enough time, I start standing like this. Completely unconsciously. But I always stop and readjust to a more normal position once I realize I'm doing it.
The hat is not there to show off my impeccable fashion sense, but to demonstrate that my head is somewhat tilted.
But yeah. It's like looking at a certain amount of books turns me into a cross between a flamingo and a velociraptor.