In one collective form of insanity, whole populations of people rise from sleep at about the same time each day, move in great herds to locations at … - A. C. Grayling

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In one collective form of insanity, whole populations of people rise from sleep at about the same time each day, move in great herds to locations at some distance from their home territory, perform repetitive manoeuvers there, return home when evening falls, slump in front of a flickering coloured light, and after a while fall asleep again. They repeat the process day after day for decades. The disease is called “normal life”, and variations from it are regarded as eccentric; if the variations are marked enough they are even called “madness” and “delusion”.
This thought is intended to show that what counts as abnormal is a relative matter.