I say, Parker, I think this co-operative scheme is an uncommonly good one. It's much easier to work on someone else's job than one's own - gives one that delightful feelin' of interferin' and bossin' about, combined with the glorious sensation that another fellow is takin' all one's work off one's hands. You scratch my back and I'll scratch yours, what?
Dorothy L. Sayer, Whose Body?, 1923