Your pubs kindly return the favor when we order whiskey. As Hunter S Thompson is reported to have quipped in a bar your side of the Atlantic: "What is this, a sample?"

That's fair, can't argue with that one.

Personally I'd have us use what the Royal Navy used to serve its rum ration in, the half-gill. This is 1/8 of a British pint or 71 millilitres, and the rum would have been a minimum of 54%!

Fractional gills were the pre-metric shot measure in the UK, but they were still pretty stingy. 1/6 gill in England, 1/5 or 1/4 gill in Scotland, and 1/4 gill in Northern Ireland.