Unflappable
I once watched a very well-dressed businessman have an epic toddler-level tantrum at a check-in counter when he was advised his flight was delayed due to fog.
He literally screamed and jumped up and down, and demanded that the the airline “better do something about it or ELSE!”
The guy working behind the counter just smirked and suggested that business guy was welcome to go outside and try and flap the fog away with his arms. Entire queue burst out laughing. Nonia_Bizness