Canada

Dunno in oz, but a US pint is 473mL, and a British pint is 568mL. Quite the difference TBH, and a bunch of bars in Vancouver got fined a few years ago due to shorting customers not providing a full pint when selling them. Some of them were even forced to buy new glasses because they weren't big enough to fit a full pint.

This is a reoccurring problem with the imperial system, since the units just turns into words and no longer hold their meaning as measurements because they're so arbitrary in the first place and are next to impossible to convert on the fly. Like a span is the width of a hand, but that's useless when the difference in size is easily 50% to double just comparing between women and men. Or how you need to specify fluid or dry ounces, yet people often don't bother and just confuse each other by not specifying. Or how complicated conversions and comparisons are to the degree that most people don't do them in imperial and just force themselves to memorize what each arbitrary unit is in a vacuum.