Henrik Kniberg recently posted a number of comic strips describing the essence of Kanban pretty well. Using humor is not only funny, I think it makes the message stick a little bit better. The only downside with this comic is that it might not make all that sense if you have no idea of what Kanban is, but if you know at least something, then it should make some sense. In the comic I especially like how it shows a good way of handling a problem.