“In 1800s, stage travel was common. Up to nine passengers shared the coach. Second-class passengers rode on top with the luggage. To keep things friendly, Wells Fargo posted rules of etiquette in each of their coaches. Here is one of them: abstinence from liquor is requested but if you must drink share the bottle. To do otherwise makes you appear selfish and not unneighborhly,”
Source: Uncle John’s Bathroom Reader – History’s Lists