If I pour any liquid like milk, juice, water, Gatorade, etc. Anything into a cup, it drives me nuts if I can't fill it up to about half an inch to an inch from the top. My wife never wants a full glass of anything and I always fill it all the way up, so if I'm grabbing her something I always forget and then she waste half a cup of whatever. But even if I just drank a glass, and only want a little more, I have to drink another full glass.