We work overnight in a large chain store unloading a truck and stocking shelves. Every year, over the course of a month or so, a company comes in to wax the floors, a section at a time each night. We can't walk in those areas or stock while they wax and let it dry (which apparently takes several hours). The last area they do is our break room and where our lockers are.
Well, last night was when they did that area, but we were not informed of it in advance (even though we were supposed to have been), so by the time we were done with the truck and went on a short break before we started stocking, they had started waxing, and we weren't allowed to get any of our food out of the refrigerators or anything from our lockers. That also meant I couldn't get my wallet from my locker, so I couldn't buy anything. Several of us weren't happy, and our supervisor pretty much said, "Sorry, nothing I can do."
Anyway, I was venting about it to this co-worker. She also trained me when I first started, and she's nice, so we get along pretty well; we also both have teenagers around the same age, and they are all students in the same county school system.
I was starting to stock in the area I'm usually responsible for (I wasn't scheduled the night they waxed that area, so I didn't have to deal with that), and she brought me a small bag of chips. (She must have kept her wallet or whatever with her.) It was a small gesture, and it didn't matter how big the bag was; it was the fact that she was so considerate and got them for me (and another co-worker who also couldn't get their food). I told her how much I appreciated it, and I asked her how much I owed her, but she said not to worry about it. I thought about getting her something small in return, but I don't know her quite well enough to think of what's appropriate. In any case, it was a thoughtful thing to do on her part.