There's one grotty spot on a plane where you should never put anything because it's so disgusting that you're better off not touching whatever's been in there.
Nobody really knows what's going on with planes more than flight attendants, and they share all sorts of helpful tips so passengers can have a bit of a better idea what's going on with their journey.
One went online and posted a rather comprehensive range of things that people might want to know.
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They said that the water was generally safe to drink and the tanks were cleaned at least once a week. While water poured from them was filtered, if it looks a little cloudy all you need to do is tap the glass a few times.
The flight attendant urged people not to go to the toilet with bare feet as '9 times out of 10 that is not water on the floor', and said passengers should definitely not have sex in the loo as it was 'so obvious' and 'filthy'.
Sitting close to the door apparently increased your chances of survival should the worst happen, just so you know.
However, one of the most popular warnings they sounded was over the cleanliness of the plane - or lack of cleanliness in some yucky cases.
In particularly they singled out the seat pocket, that little flap of fabric in which you could store things while you flew up, up and away.
They wrote: "Never, ever, ever, EVER use or put anything in the seat pocket.
"They are cleared of rubbish but are never 'cleaned'. I have pulled out and seen all sorts been pulled out from there.
"Dirty tissues, sick bags, knickers, socks, peoples feet, gum, half sucked sweets, apple cores... and then next flight you go and put your phone/laptop/iPad in there."
For those particularly worried about hygiene, they suggested bringing antibacterial wipes or sanitiser on shorter flights as they were cleaned less thoroughly, and you might want to give your space a once-over.
People were disgusted by all the things that others stuck into the seat pocket on a flight, particularly when the flight attendant wrote 'people's feet'.
Someone else who said they cleaned planes for a living described the seat pocket as 'always f**king gross', so really do give it a bit of thought before you decide you want to put your valuables in there.
Another flight attendant chipped in to say they'd had a passenger once complain because she'd put her book in the seat pocket only to discover it was 'covered in puke' when she took it back out.
Others joined the conversation to say that, while whatever might be tucked away in the plane cabin might be disgusting, it'd be better not to think too hard about what else was onboard the plane.
While you're at least able to enjoy seats and windows, your luggage might be sharing space with all sorts of things which planes transport around, including dead bodies being repatriated.
Topics: Plane Etiquette, Travel, Social Media
Joe Harker