I read that as 'a pint per vowel'.
If someone's getting a pint for every vowel they utter, that's going to be a very pissed someone.
Unless they're from New Zealand. Haven't got a vowel to their name, that lot.
How do people/languages like that get by without using vowels? It's interesting how different peoples have developed vastly differing ways of using letter sounds.
It'd be far simpler (and I'd have had a far less strenuous time in my GCSE Spanish aural exam with Miss Francis) if we'd standardised the whole thing from the start.