The scene is some time in the old era when cockpits had round dials plus flight engineers and navigators.
The crusty old-timer B-17 captain is breaking in a brand new navigator.
The captain opens his briefcase, pulls out a .38 and rests it on the glare shield. He asks the navigator,
"Know what this is for?"

"No, sir," replies the newbie second Lieutenant.

"I use it on navigators that get us lost," explains the captain, winking at his copilot.

The navigator then opens his briefcase, pulls out a ..45 and sets it on his chart table.

"What's THAT for?" queries the surprised captain.
"Well, sir," replies the navigator, "I'll know we're lost before you will."
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Good One!!

We used to say that 144 navigators equal gross ignorance.