I can't recall a day in the last 50 years when I did not have a camera with me. I always carry a shoulder bag, my pipe, tobacco and matches, spare film, possibly a second camera body. Just a habit and, yes, I usually do shoot a roll or two during the day - though not today as it was snowing/raining/slushy outside - so I stayed home, read and took pictures of a table lamp in front of me.