A few years back my wife wanted to take a stab at making some homemade jelly, so being the obliging fellow that I am I said I'd help her out. In the process of preparing all of the required materials she discovered that she needed several small glass jars, and being that we'd just bought a house with a root cellar full of old glass bottles and jars I knew where to get just the jars she needed. So, down to the basement I went, where I picked out a dozen or so of the jars I felt were appropriate for this jelly making expedition, brought them back up to the kitchen and put them on the counter. I then went about my business elsewhere. A short time later I came back into the kitchen to find my wife weighing each of the jars on the small food portion scale we kept on the counter, and telling me that these jars wouldn't work. I politely then asked her "What Are You Doing?", whereupon she proceeded to explain to me that "this recipe called for 1 dozen 6 ounce jars".
(From the "Rest" of RHF)