Went to a beer festival with standardized cups, turns out the 250ml mark was only around 227ml.

Went to this beer festival with a lot of different local breweries back in December. And basically they were cheating everyone by 10%. I'm not even sure if it was on purpose or just happen because they bought the cheapest beer cups they could find with their label printed on it... But they were cheating nonetheless. Also I filled the cup slightly above the 250 mark just to be "fair". But still only 227ml at the mark.