You know you’re probably pretty drunk when you only notice six sips in that actually you are drinking a completely different beer to the one you ordered. Last night post a free wine reception we went to the Cittie Of York where I asked for three pints of Pure Brewed. What came back was clearly one pint of pure brewed and two pints of White Beer. IT WAS CLOUDY (hint of lack of titular purity). I know the white beer, it tasted pleasantly bananary. And yet I drank it for ages without noting.
In this situation, it is best not to return to the bar staff. I had drunk too much of it and missing the obvious indications would make me a laughing/barring stock.