My pet peeve

One of my biggest pet peeves is not something someone notices every day. It's kind of complicated so let me lay it out for you. Your art teacher gives the class a peice of blank paper, that is blank on both sides. Then she tells you to put your name on the back of your paper. Everyone then flips the paper over to put their name on the back. But why do they turn their paper over, when it's exactly the same on both sides???