Talking of local ideas of etiquette you can find all kinds of differences for example in the bathroom while staying in places like Greece or Cuba you may find notices telling you to dispose of toilet tissue in a bin rather than flushed away, which can be confusing if you didn't get around to looking at the notice and being creatures of habit creating all kinds of problems like flooding out holiday rooms! After an experience like this in Cuba my son was on my case everytime, it was like the Spanish Inquisition.