I love that you've brought people's books and DVDs back to the library for them!
After having discovered sex and drugs and rock-n-roll in the early 70s, I barely graduated from high school. Interestingly, one of the courses I had to make up in summer school was gym. It was about the last time I was physically active before taking up cycling a few years back.
After a couple of decades in IT, these days I work as a clerk at the front desk (Circulation) of a neighborhood branch public library, starting just after lunch and working until closing. It's essentially a customer service position.
I've had patrons stop me in the street to return books and DVDs. Fortunately, there's usually room in the panniers. I've also ridden a few blocks with patrons on their way to the library.
OTOH, while the library is in a borderline area, my commute takes me through what can only be described as da 'hood. I won't stop there. I've been offered five bags for my bike. Although, that was for my now-retired bright yellow full-Sora Trek. My bare Ti full-DuraAce Litespeed has never attracted any attention.