The attachment underneath most common office chairs used to raise or lower the
chair's height, or when pulled out, to make whoever
will sit in it next look
like an idiot. When the lever is in, the occupant can recline to a reasonable distance. When this lever is pulled out however, the unwitting fool
will recline way further than thought possible, causing this person to experience the feeling of falling. This
may result in, but is not limited to: accelerated heart rate, loud outbursts of curse words, loss of colon control, and (according to a study I just made up) over 1000 heart attacks per year.