I've worked at the mall Customer Service desk for almost 10 months. During that time I've become friendly with quite a few people...security guards, housekeepers, and fellow mall employees as well as frequent shoppers and mall walkers.
Some of them wave or say hello as they walk by, and a few stop to chat. If they work in the mall, chances are they wear a name tag and I've been able to figure out who's who. The rest are just nameless friendly people.
There's one pair of mall walkers who I've figured out are avid sports fans. Their shirts change with the seasons (Cardinals in the spring and summer, Rams during football season, Mizzou for basketball), and some other college teams that I assume have special meaning. We've had several short discussions, mainly about sports, but it's more like a walk and talk as they're passing by.
Today one of group members came up carrying a large nylon bag. They'd received it at a baseball game and thought I might like it. Inside were a few promotional trinkets and a souvenir soda cup. Even though the things were only worth a couple of dollars, I was touched they'd think of me.
We talked for about five minutes, then they continued on their walk.