For some people, when they step on a plane, all rules of social etiquette go out of the window.

We’ve heard stories of barefoot bathroom trips and smelling snacks – and let’s not forget the flight that got grounded due to one passenger’s particularly explosive case of diarrhoea.

But now, an American flight attendant who goes by Cher on TikTok has revealed what she believes is the single worst thing a passenger can do on an airplane.

And given some of the aforementioned gross stories – it might surprise you… and we’re pretty sure we’ve done it ourselves.

‘Putting any type of bottle that has liquid in it in the overhead bin,’ Cher…