> Also in the US (probably due to lack of training and the customer too embarrassed to complaining) tend not to fill it the brim (and so not even 16''). I've seen 2-3 inch heads and asked them to top it up. They look at me as if I've just insulted George Washington
Really, no self-respecting Canadian would drink beer out of anything except directly out of the bottle, can, or keg.
They think a big head means a good lager and every pint you get is 80% head.