One heartwarming and one hilarious.
In the "Public" library category:
I was washing my hands in the public bathroom and exchanged looks with an elementary school-aged girl, maybe in 4th or 5th grade. She looked familiar for some reason so I didn't immediately look away like I normally would. This gave her the opportunity to ask "Do you remember me?" I told her that I remembered that I'd helped her before, but I couln't remember with what. "You helped me with science fair," she said, "and I won first place!"
And in the "College" library category:
I was over in the area where the popular magazines are, pulling the oldest issues to toss. The noise I made disturbed a student who was sleeping on a nearby chair. He said "You work here, right?" I said that yes I did, and he asked "Can you tell me if there's a better place in this library to sleep?"