What you don't want to see when you look out of your plane window: the aircraft shaking violently.
But it does happen - and one passenger on a recent flight in Australia managed to capture the scary scene on camera.
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The service was flying from Burnie, Tasmania, to Melbourne when it hit strong turbulence at around 10,000ft, reports mashable.com.
The video was uploaded to Instagram, with the headline: "Turbo-ulance. Windy! Flight from Burnie to Melbournel. 9 October 2016." Along with a number of hashtags, there was one that read: "#PoopinPants".
A user commented: "Omg so scary!!!! It's bad on the ground too."
Indeed, the state of Victoria in Australia has been lashed by storms in recent days.
There have been reports of very strong winds leaving 40,000 homes without power.
The Age reports that gales have pulled around 2,000 trees from the ground, throwing them across roads and into cars and homes.
One woman, aged in her 50s, was killed when extreme winds saw a tree crash into her property in an eastern suburb of Melbourne.
Pictures of the destruction have been shared on Instagram.
It is believed the worst of the storm has now passed, although there are still warnings over unsettled weather in the area.