The inspector puts this question to him: "What would you do if you realized that 2 trains were heading for each other on the same track?" Johnny says, "I would switch the points for one of the trains."
"What if the lever broke?" asked the inspector. "Then I'd dash down out of the signal box," said Johnny, "and I'd use the manual lever over there."
"What if that had been struck by lightning?" "Then," Johnny continues, "I'd run back into the signal box and phone the next signal box."
"What if the phone was engaged?" "Well in that case," persevered Johnny, "I'd rush down out of the box and use the public emergency phone at the level crossing up there."
"What if that was vandalized?" "Oh well then I'd run into town and get my uncle Bill."
This puzzles the inspector, so he asks, "Why would you do that?" Came the answer, "Because he's never seen a train crash."