Our elevators in the office building works by sensing heat from the fingers when touched. When you want to press the button to get you to a particular floor, it will only respond when body heat is felt. If you try using a pen, or any other inanimate object to do likewise, the respective buttons will not be lighted up.
My fingers were so cold from the aircond that there was no response from the buttons. I had to press a few times and even tried rubbing my other warmer parts of the finger to activate it. Really, my fingernails are this shade of purple!
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