Time/date being the best example of this. I think I've seen every possible variation by now, except maybe putting the year in between the month and day. Drives me absolutely crazy.
He rubs it, and a genie emerges.
Genie: "I shall grant you one wish, mortal."
Man: "I wish to bring my grandmother back to life."
Genie: "Apologies, but reviving the dead is beyond even my vast powers. Perhaps you'd like to make a more... achievable wish?"
Man: "Alright then, I wish for worldwide adoption of the ISO 8601 date format."
Genie: "...Uh, where did you say your grandmother was buried?"