NEXT time you fly, listen out for the bells and dings being played overhead if you want to hear from the crew are secretly saying.
A flight attendant has revealed what the chimes mean when - including the one you really don't want to hear.
Flight attendant Tommy Cimato often reveals secrets of the skies on his TikTok account.
He explained in his what the noises mean on a flight.
He said: "A high low chime means one flight attendant is trying to call another flight attendant, or the flight deck is trying to call us.
"If you hear three of those it means it's an emergency, but you will never have to hear that."
He also said what one tone means, which is likely to be used by travellers.
He continued: "A passenger is calling one of the flight attendants from their seat or they could be calling from the lavatory."
People were stunned to hear about the noises, with many now terrified to hear three chimes.
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Someone joke: "Fun fact: If you hear 3 chimes, it's probably your last time hearing it."
Another person agreed: "New fear unlocked: hearing three tones."
One person wrote: "Great now we are all going to be sweating while counting the beeps."
Here are some of the other mystery noises and phrases you might hear on a flight, including ones that signal turbulence is ahead.
Qantas revealed the "dong" noises are often used to signal the plane is taking off.
And here are the strange noises you will hear on flights which are nothing to worry about.