When it comes to travelling on a plane, there are certain unspoken rules of etiquette we all follow.

For instance, use headphones if you're listening to music and don't recline your chair right back into someone's face.

It's also common decency to keep your shoes and socks on during a flight - but we've seen people put their bare feet up on other people's seats and even use their toes to work a touch screen.

A more recent clip of bare feet on a plane is currently doing the rounds online - and it's sparked outrage.

Shared by the popular Instagram account, Passenger Shaming, the video shows a woman in a face covering giving the man sat behind her a foot massage.

The man raises his leg in the aisle, so his foot is level with the woman's arm rest.

She then takes hold of his bare foot and begins rubbing up and down it.

The post was captioned: "JFC! Come on!!!!"

It has since gone viral, with many people commenting to share their disgust.

One person asked: "WHAT THE ACTUAL F**K IS THIS?!"

Another wrote: "I am not ok after this."

A third said: "Oh no just no no no!!!!! All the nopes that ever noped in Nopeland!!!!"

Someone else replied: "OMG get a room......Gagging!!!"

"I literally screamed as I saw this," commented a different user.

This comes after a man left fellow passengers on a plane baffled by his attempts to reheat a slice of pizza.

In an effort to warm up his snack, the man turned on the overhead light above his seat and held the pizza just millimetres from the bulb.

The bizarre moment was captured on camera by a fellow passenger and shared by Passenger Shaming with the caption: "Just warming up some leftovers."

It garnered more than 8,300 likes as others were left divided by his cooking technique.

One commented: "You can't fix stupid."

Another said: "That's an LED light. It doesn't put out heat."

But a third thought it might actually have work, claiming: "I actually got burned from touching that light after hours of it being switched on."

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