A couple days ago, I forgot my keys at work. Fortunately, the building manager had a spare key.
After reading the "Thrown out of Subway" thread, I decided to bring my bike inside a grocery store on my way to work. So I get in the store and it has these little turning "barrier". Too much trouble, I'll just go to the other store. Besides feeling a bit odd, it worked great! I bought some new panniers (Arkel T-42). Open slightly and throw the stuff in. Plus it's easier to pack at the cashier and no need for plastic bags. Grocery shopping made easy. I had vision of dozens of people shopping with their bikes inside.
Got a mirror as well. A mountain Myrricle. I have bar-end shifters so I attached the mirror to the bars with a seatpost light mount. Works nicely though I need a better clamp. The mirror tends to slide down on rough pavement.
Edit: It's very hot lately. I don't mind on my commute but I work night shift so I don't get any decent sleep at home. Since I work long hours (but not many days

), I thought I might as well bring a matress at work and sleep in the basement.