Does anybody remember the 1970's-era seat-pocket safety card that National Lampoom published? They wanted you to replace the real one with their version. Their caption about emergency oxygen was, "It's like watering a dead plant, but we've got it if you want it." In place of the diagram of the emergency exits, they showed a cartoon of an airplane broken into pieces on the ground with bodies laying all around. The caption read, "Plenty of exits now, so, everybody out!" A third picture was a diagram of an airplane with a notation of, "There are 42 fuel locations on this aircraft. Knowing every location could make the difference between a pleasant trip and an oxydized one."

It was truly a classic. If I can find it after all these years, I'll try to scan it and post it. :-)