Yep, worked pizza delivery throughout college. There are some people who just become part of the schedule. At my place we would do stuff like keep a clean pizza slicer and paddle ready to keep things halal for the Muslim couple who ordered every Thursday night.

We had a set up with a shut in that predated anyone's employment at the store. Every Friday as soon as we opened we would drop off 2 cheese pizzas at the porch and take the money left in the mail box. Never met the person, but they had a pretty sweet deal because they still only paid the price from like 6 years before because no one could ever get a hold of them. They just became kinda a store tradition.

We also had a couple of older regulars that we would literally call and check on if we hadn't heard from them in a while. This was nearly 20 years ago in a small college town, so things may be different now.