It's a psychological thing as far as I have been told. As in, the smaller the "amount" or "area" of power you give someone to enforce / defend the fiercer they will do so.

I saw this live once. A tiny office building's front entrance security guard. Had a sign in/out list for visitors. He was o the stereotypical leaned back in his chair, far away from the heightened desk type guy. Our visitor wanted to sign out. He knew the procedure from other days. The list sat behind the counter but in plain view. Our guest thought nothing of it so as he mentioned he'd leave and just sign out he grabbed the list from behind the counter. You should have seen how fast the security guy got up from his chair and started shouting at the guy what the... he was thinking just grabbing that list! He pulled the list back out of our visitors hands and then we heard a littany of other stuff. Until he finally let him actually sign out

I guess one can make use of this in some cases :)

I've read of someone who worked at a bank who was told that after getting a counterfeit, looked them up in the phone book, and they dealt with it promptly.

But in all fairness, the distinctions are all pretty arbitrary, I'm sure people were laughing as much when the navy spun off their weather stuff and when the army spun off their flying stuff as they do now with the air force spinning off the space stuff.

https://www.youtube.com/watch?v=N5S74kKimFs

Jake (Andy Samberg) and Charles (Joe Lo Truglio) form an unlikely alliance with Jack Danger (Ed Helms), a nerdy lead investigator at the United States Postal Inspection Service, as they embark on a mission to crack the case to bring down a drug dealer.