My favourite was when I went to an air show at RAF Mildenhall. The USAF were in charge of the base of course, so things were run in a very USA way. Most of the week prior, C-130s had been arriving filled with American food and drink (USA beef, American Coca-Cola, Budweiser, etc. - you know, health food ). There was even a huge burger stand called "SAC Donalds". (SAC = Strategic Air Command)
I arrived and followed verbal instructions and hand signals on parking from the large number of USAF personnel directing traffic - all the parking spaces on the grass had been carefully pre-planned to maximise capacity and traffic flow. I parked up and the small young USAF lady in her dress uniform smiled and thanked me, all good, all friendly. But the guy now parking next to me decided he knew better, and didn't follow instructions, leaving his M5 parallel to mine but half a car length back so he could take two spaces, hopped out and locked his car. Not a good move.
Young lady: "Sir, you need to move your car forward please."
M5 Driver: "No. I don't want my expensive car jammed in that tight, something might happen to it."
YL: "Sir, your car will be fine. Please move it forward."
MD: "No - there's plenty of room for all the cars, me taking two spaces isn't a problem."
YL: "Sir, parking layout has been demarcated to maximise capacity, and your car is taking two spots. You must move your car forward please, sir."
MD: "No - I'm parked there and that is that."
YL, in a very firm voice: "Sir, I am in charge of this area. You WILL get back in your car and you WILL move it to the prescribed parking space NOW, or I will be forced to move it for you, sir."
MD: "No - it's just a parking spot! I'm leaving!", and walked off.
I stuck around to see what would happen next. She got on the radio, and within a minute, four USAF MPs showed up. The young lady took her baton and smashed the driver's window, leaned in and undid the hand brake. The MPs then pushed his car forward into the space, the hand brake was put back on, and another car directed in behind his. A note was then left on his windscreen that said, "You were told your car would be moved if you didn't do it as directed, and it was. As you failed to follow clear instructions given to you on this base by USAF personnel, the US Air Force are not liable for any damages caused by your failure to comply. Nonetheless, we hope you enjoyed the air show."