After this ship landed back at base, two technicians got to talking about the fact that it survived.
Technician 1: "You know what we should do next time, right?"
Technician 2: "Strengthen the parts that got damaged?"
Technician 1: "No, we should strengthen the parts that didn't!"
Technician 2: "Why do you figure?"
Technician 1: "Well, this plane proves that the parts that got damaged this time are already strong enough to keep the plane flying. The planes that got hit in other places never returned, so those parts must be strengthened!"