[keldaris]

I guess it's mostly just a difference in volume then. Google tells me 8 oz translates to about 230 ml, that's pretty much the average glass of juice around here.

[brianwawok]

People would complain if a resteraunt give them such a small glass. 12 oz / 350 ml is much more common drinking glass size here.

People going to McDonalds for soda get 32 ounce / 950 ml

Some crazy sizes here...