You're boarding an airplane and overhear a mechanic tell the pilot, "I have no idea how much fuel is in the tanks. Probably enough to get you there." During a medical exam, you notice a nurse accidentally drop a needle on the floor, then pick it up and prepare to use it to draw blood from your arm. At a hotel, you inadvertently go to the wrong room but discover your keycard opens the door anyway. In all three situations, you'd be justifiably upset with the so-called professionals you trusted ...

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