Never know when you'll need your camera
Q: why do you carry a camera around? A: never know when you'll see something worth capturing.
This was a corridor to the restrooms in a local mall. Within three frames, mall security showed up. Security: "Can I help you?" Me: No, I just liked this view and took a picture. Security: "This is private property; no photography allowed unless taking photo of friends or family."
I liked that security showed up so fast and hope they would be that quick if there was something really bad going on.