I've had this post, uhh, percolating on the back burner for awhile now... heh heh.
A couple months ago, I left work mid-morning to go get a coffee at Cafe Del Sol. I used to be fairly regular there, back when I had to leave the house at 6:30am to try and avoid traffic. I'd get in to town around 7:30am, so I'd pull in there and have a caffe latte and weeze the juice off an open WiFi hotspot in the area (using SSH and Privoxy to tunnel all my traffic, just to be safe) until it was time to go to work.
As I sat there surreptitiously people watching while doing a little web surfing, I tended to see the same people at the same times every morning. You could tell when someone was running late, and the staff behind the counter knew most of the "regulars' " orders and started preparing it while they were still standing on line.
After I bought a Vespa, I could leave later in the morning, as instead of 60-90 minutes, my commute was down to about 15. I would then pop in two or three times a week, later on in the morning and see a completely different group of people. These people were less stressed than the early morning peeps, probably because they lived closer to town and didn't have to sit in traffic.
This out-of-habit mid-morning jaunt caught me off-guard because I didn't recognize ANYONE in there at all. The crowd was completely different. Instead of office-workers (mostly) grabbing a cup of joe on their way to the office, this crowd was the stay-at-home moms and the lifestyle of leisure followers who rose early, went for a walk, or to the gym and then popped in for a coffee for something to do.
So, just for shits & giggles, if you happen to frequent a coffee shop at the same time every time you go, try mixing it up a little and see if you notice the same sorta sorta.