People always look at me funny when I carry my MacBook Pro to the bathroom. But I think anyone who doesn't take their computer with them when they get up is the strange one. I'm certainly not going to risk having such an expensive computer taken!
This is coming from someone who has had three Apple computers stolen. One Macbook from the airport, and an IMac and MacBook Pro from my home. There is NO WAY I would ever leave my computer unattended in a public place after such depressing events.
I'd like to recognize the Pt Loma Library as having one of the nicest bathrooms in the area, perfect for photographing on your way in or out with your computer.