You go to a pub and order a pint of lager. In the UK, that's 568mL, and you think of it as one drink -- even though it's clearly not. You go to the same pub an

You go to a pub and order a pint of lager. In the UK, that's 568mL, and you think of it as one drink -- even though it's clearly not. You go to the same pub and order a shot of whiskey, and it's about 1.5oz, so it's the same as you think it is.