Almost everybody has been using pillows on planes wrong, according to TikTok.
If you've ever been on a flight that's longer than a couple of hours, you've probably found yourself bored of staring at the inflight TV or playing on your phone.
The next obvious thing to do when wedged into a small seat beside two strangers is to tumble into unconsciousness.
A popular way of doing this is by using a travel pillow, to support your head and neck.
Many of those in that category have been shocked to discover that they've been using the small inflatable supports wrong all this time.
One TikToker, known as @Sidneyraz, has shown how to sleep a little more comfortably while you're 40,000 feet in the air.
The majority of people put the C-shaped neck pillows with the thick, rounded part at the back of their neck.
Sidneyraz explains that they're supposed to go the other way around.
He displays the correct position, resting his sleepy looking face on the rounded bit as it lies beneath his chin.
It's not the first time a TikTok user has shared their travel tips and experiences.
In a recent video Lora McLaughlin showed her viewers how she travels with her dogs on planes.
Most US airlines allowed dogs into cabins, so long as they're properly housed in a suitable bag and have a ticket.
While service animals such as guide dogs travel for free, holidaying hounds must be paid for and count towards carry-on luggage.
The 52-year-old former news correspondent regularly takes her dogs Tippy and Tiger across the US with her, and stores them in tidy roller bags when she does.
She added: "One of the reasons we went with little dogs is... for ease of travel for both the dogs and us. It was really hard on our larger dogs and us to put them in cargo."
It's worth noting that airlines such as easyJet, Flybe, Jet2, Ryanair UK, Virgin Atlantic and Wizz Air UK all have a complete ban on pets, whether in the cabin or as checked luggage.
