Though most frequent fliers have experienced some pretty bad turbulence, it is likely none were equal to the extremely bumpy ride one Singapore Airlines flight endured.
The flight fell 20 meters when it hit a patch of severe turbulence, causing everything in the plane that wasn't secure to go flying to the ceiling.
Eleven passengers and one crew member were injured on the flight, though not seriously. They were treated once the plane landed in London.
One passenger managed to get pictures of the aftermath.
Alan Cross, the man who took the photos, said passengers were warned to expect the turbulence and that breakfast service would be temporarily suspended.
But a few minutes after the fasten seatbelt sign came on, the captain issued an order for all flight attendants to take their seats immediately.
Soon, the plane plummeted.
Cross said it felt like "being in an elevator with a cut cable or free-falling from some amusement park ride."
After it was over, the flight attendants quickly cleaned everything up.
"The cabin crew was amazing in the aftermath, as were fellow passengers who helped everyone around them then in a calm and efficient clean-up," Cross said.
While most fliers never experience turbulence of this severity, some research suggests it may become more common.
Earlier in the year, scientists said climate change could affect flights from London to New York.
Supercomputer simulations from East Anglia and Reading universities analyzed the jet stream over the North Atlantic, noting that climate change in the future will increase air turbulence.
They found that the chances of hitting significant turbulence will rise by 40 percent to 170 percent by 2050.
Dr. Paul Williams from the University of reading said, "Most air passengers will have experienced the uncomfortable feeling of mid-flight air turbulence. Our research suggests that we'll be seeing the 'fasten seatbelts' sign turned on more often in the decades ahead."