...you see something interesting and start looking at it from different angles and viewpoint, squatting down/standing over to another side/tilting your head and composing, even though you don't have a camera.
...you cringed when you see the most beautiful sunset and you don't have your camera with you.
...you think of noise reduction when you see SMRT's NR 1-6.
...you find it challenging to travel with non-photographers because they are walking way too fast and they insist on driving most of the time and they are oblivious to the beautiful golden light around sunset