A Mbb Aeronautic Development Engineer Told Me This Company Joke:
For a long time the engineers walked through the house with their ears hanging, and in low spirits. There was no other topic, even at the toilet they would discuss ballistics, angles, acceleration, resistance, and touch downs.
In their wild dispair they asked the toilet man what to do. He said: "Well, you might want to perforate the material exactly at the line where the wings used to break off."
The engineers would have grabbed at any straw, so they heeded the advice and put into practice what the toilet man had recommended. And you wouldn't believe it: The model air plane in the test flight stayed in the air, looped as expected and touched down safely.
Now the engineers were curious how a toilet man could have known the solution, and they asked him. Casually, he answered: "Aw, that was a no-brainer. Have you ever seen toilet paper break off where it is perforated"?