I thought I'd pass this tip along. When you buy a jug of milk, turn the jug and make sure the milk flows freely through the handle. I bought a gallon one time and checked the date, and it hadn't been opened at all, so I thought I was good. I go to use it the next morning, and noticed that the milk in the handle was chunky and would not flow through the handle. Of course, I was in the middle of making breakfast, so this was rather frustrating, but the store was only a mile away, and I was able to exchange it and get back to breakfast. So now I always do this when I get milk so that I avoid the same frustration.