'Close the window!' Moment tourist is left regretting leaning out of window to pet lion

This is the moment a lion lets a tourist know how they feel about being petted as they mind their own business.

The video, filmed in the Serengeti, is titled: "Still the dumbest tourist ever?"

It is not clear when the video was originally filmed, but it was posted to the Maasai Sightings YouTube channel on Wednesday.

"A tourist in serengeti decided to touch a male lion and almost got her face ripped off," the caption says.

"This is a very dumb thing to do and you can easily get yourself killed and banned from a national park by doing this."

The clip shows a tourist leaning forward to reach out of the open window to pet a lion which has its back to them.

The animal turns around and stares at them, and a voice from inside the vehicle says: "Close the window."

As someone struggles to shut the window, the lion jumps up and roars.

YouTube users were quick to comment on the "stupidity" of the tourists.

"Lions are freaking strong...that window wouldn’t hold Mufasa back if he wanted to get in," one said.

Another wrote: "I wouldn’t feel any sympathy for him had the lion gotten a hold of him. That’s nature man."

A third said: "Dumb, yes, but she can brag and say she touched the wild king, not a zoo one."

Another YouTuber commented: "People see lazy lions in zoos, or snoozing during the day in the parks, and have absolutely no idea how freakin' fast a lion actually is.

"I mean, less than a second and this guy could've had a faceful of claws. Go pet your house kitty... feels much the same. House kitty can also tear your face off."