I strolled to the park one recent evening to see a fireworks show. My path took me past the high school tennis courts. Two guys and a girl were casually volleying back and forth on the court furthest from the only gate. As I walked along the fence, I noticed two tennis balls that had rolled through the gap at the bottom. Being the nice guy that I am, I picked them up and tossed them over the fence. One of the guys said, “Thank you.”
I turned the corner and began walking along the edge of the court when I found two more balls lying in the grass (balls 3 and 4 on the diagram below). It was no effort whatsoever to pick them up and toss them over the fence. Again, one of the guys said, “Thank you.”
That’s when I noticed balls 5 and 6. This was beginning to get old. But having already tossed four balls, it seemed petty to stop now. I picked up the two balls and began walking toward the fence when I noticed ball 7.
Sigh.
I walked over and picked up ball seven and tossed all three of them over the fence. I didn’t get a “thank you” this time. I don’t know if they’d exhausted their capacity for gratitude, or if the situation was beginning to get as awkward for them as it was for me.
I continued my trek (indicated by the red line). That’s when I noticed balls 8 and 9.
I was dangerously close to becoming a full-time ball boy. I was no longer receiving any acknowledgement for my efforts. But if they had to walk all the way to balls 8 and 9, then what good had I done up to this point? So … I ask you. What would you have done if you found yourself in my situation?

I’d back up 30 years or so and develop the skill of selective observation. :-)
Good post, btw. No dead presidents. :-)
Well, you gotta pick em up at that point, but you have to make a witty remark while returning these.
Such as?
Not sure, not feeling very witty. True wit has to be in the moment. SOmething along the lines of, “These’ll cost you 25 cents.” Or, “Should I fill out a W-4 soon?” Or, “Maybe you guys should consider lessons.” Or “You’re supposed to hit it over the net, not over the fence.”