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It grates when you hear someone say "over and out" and it takes every ounce of self control to not correct them.
You hear somebody speak in phonetics who then says "nine" instead of "niner" and it irritates you.
You wish everyone would read back important instructions. "Let's meet up at the pub tonight @ 20:00" - "Ok, meet at the pub at 20:00 tonight" - "read back correct"
You wince at the price of the MOT & Service on your car as you realise you actually spend more time flying than driving your car about the place.
When installing a cat flap you find yourself measuring the height of your cat in nautical miles and then drilling everything, sawing everything, based on nautical miles.
You see co-ordinates written down and have a clue as to where that may actually be!