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Is it ever acceptable to talk to a stranger on an elevator?
If there are six or fewer people on the elevator, no. However, if the group is larger than six, you have achieved an Elevator Humor Quorum and someone must make a remark about the elevator’s lack of size or speed in order to relieve the tension created by standing in a tiny space with six or more strangers. If another member of the group makes the remark first, Elevator Humor Solidarity obligates you to chuckle mildly.
— From the Urban Etiquette Handbook
