How do the up and down elevators never run into each other in the elevator shaft? You would think that at some point, someone on a bottom floor would push the button for the up elevator at the same time someone on a top floor would push the button for the down elevator. Either all the elevator riders have gotten very lucky or elevators are marvelous machines. An up elevator and a down elevator in the same shaft with no recorded collisions? Incredible.
TIM PAYNE 
It’s a good thing they know what they’re doing, because we’re on ekecators alot here:)
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