I was in a fabric store recently and the clerk was informing another customer that a fat quarter was equal to a half yard of fabric. I intervened to say, no its a fourth yard, thus fat quarter. The clerk was hateful and said 18 inches is a half yard. I told the customer it's half as wide so it's a fourth. She was buying for a large project and I just couldn't let her be misdirected.
my pet peeve: stores who don't train their staff.