My common courtesy wake-up call: MIT mechanical engineering students often had to go through the course "secretary" to see their faculty advisers of high-level MechE professors. At the time, the course secretary was a middle-aged women with a desk outside of the MechE administrative offices. When you walked into the office, you spoke with her and she would send you to the appropriate faculty office. Whenever any of m…
It sort of sucks that your TL;DR is "you never know what people might be able to do for you, so be nice". Just fucking be nice to people. It's not always about what they can do for you.
(Though "nicer message" is subjective)