Comment by mkopinsky

Initially I was sure you were talking about my Scoutmaster. (The details diverged in the end.) The expected arrival time for camping trips was always something like 9:59am - that way people would hopefully show up at 9-something or maybe just a few minutes late like 10:10. If the expected arrival time was 10:00, people would interpret it as 10-something and show up at 10:45.