When it comes to café etiquette, a chair that is spare is there to be shared, counsels our Modern Guru. width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport"/>Cafe etiquette: Is it rude to ask to sit at a table with strangers? Kirribilli is also a famously hilly suburb, so I’m guessing you would’ve been pretty dishevelled and sweaty after your two-kilometre morning walk – and when you asked this couple if you could sit.