Not to mention feet, inches, etc... so called imperial measurements.
Whilst metric is easier to use in calculations, computers etc, there is a lot going for the imperial system in terms of reflecting natural and everyday needs. Generally you can express most everyday measurements with a smallish number and appropriate unit.
So weight of flour in a recipe is 8oz, not 228g - or even 225 or 250g (which encourages an understanding of precision - 'about 8oz' is fine, what is 'about 225g'? 223? or 220? or 200?) Weight of people though, is in stone, like 12s 6lbs not 78.9kg (or, god forbid, 174lb) - much easier to get a feel of what the numbers are. Is 245lb a normal weight a person or morbid obesity? (USians,don't answer that)
People are 5'10" tall not some silly number of cm.
A pint is a good quantity of beer, a demi-litre isn't enough, a litre is excessive (and usually all froth if you're in Munich)
And the world would be a better place if some barking mad people weren't under the impression that a pint contains 16 fl oz. For heavens sake, 16 oz is a pound, 20 fl. oz. is a pint