I too have the ability to 'give that look' Guess I got it from my mother.
When planes were very delayed in Chicago due to storms, the queues of people trying to get to wherever were agonisingly long.
The airport staff were doing their very best to sort things out and, although frustrating, I would rather be safe on the ground than at risk in a plane.
A man in front of me was being so rude to a young girl who was doing her best to remain polite. He was shouting at her and being the big "I am important"
Did not impress me and when he set off on his third tirade at the girl I could not but help say "Excuse me sir, is it your birthday?"
He stopped and looked at me (as did many others because this was said in my instructors voice and very English posh accent!
"He looked at me askance and said "No, it isn't. Why?"
"Oh." says I, "I thought you were giving yourself a birthday treat by being so rude and ungrateful but obviously it is just your normal way of speaking to people."
All around just burst out laughing and the man picked up his bag and stomped off.