Of course that's where the adage came from, gosh, world+john frey knows that, dont YOU even know it?

On a serious note though, john frey, chill out.

Back in the last century during WWII, or was it WWI? I forget. Anyway, everyone was to turn in their bread knives cos the war effort needed the steel. Thus was born the pre-sliced loaf, saving the skullery maid countless hours of slicing and the associated tendonitis (although they did not call it that back then). Skullery maids everywhere loved the pre slice loaf and thus was born the adage.