Flight attendants spend a huge part of their lives on planes, so if you ever need any advice on what you should and shouldn't do on board, then these are probably the best people to talk to.
And if there's one thing these professionals really hate passengers doing, it's taking their shoes off.
An ex-flight attendant recently responded to a Quora thread asking why passengers are asked to wear their shoes during takeoff. Tony Luna wrote: "Besides stinking up the whole cabin, footwear is essential during an airplane emergency, even though it is not part of the flight safety information.
"During an emergency, all sorts of debris and unpleasant ground surfaces will block your way towards the exit, as well as outside the aircraft. If your feet aren't properly covered, you'll have a hard time making your way to safety."
And that's not all. Flight attendants also told Cosmopolitan that seeing any passenger walking around a plane without their shoes on makes them cringe. Hard.
And the reason why is pretty gross. You see, plane toilets aren't necessarily properly sanitised in between flights, aside from a quick spray and restock of toilet paper, and the floor is rarely attended to. That liquid on the floor? Probably not water. So why would you want to get your feet wet?
If someone is sick on a plane, a cleaning crew will come in to deal with it, but instead of cleaning the whole carpet, they'll just spot clean the problem area. So next time you fly, you might want to keep your shoes firmly on your feet.