I first came across this when I lived in Redfern in 2001-2002, but it has been the topic of some discussion recently. Some people, a significant number it seems, in Sydney, believe that if you have breakfast with someone, say in a cafe, then you must have had sex with them. Apparently it is not possible to have breakfast without having first had sex. Of course, this leads to all sorts of false and incorrect conclusions as at the end of the day it is a load of shit.