a grizzly bear in Denali National Park in Alaska does the unusual to entertain tourists. Photo: Screen grab

A grizzly bear in Denali National Park in Alaska does the unusual to entertain tourists.

A grizzly bear spotted by tourists in Alaska's Denali National Park was minding its own business, meandering down a hillside, when it suddenly began doing something you don't often see bears do.

The grizzly bear started rolling down the side of the hill, much to the delight of the amused tourists. David Pangborn of Duluth, Minnesota, zoomed in to get close-up video of the unexpected behavior.

We've seen wild bears do all sorts of things, such as climb a sheer cliff, walk on their hind legs, rub their backs against a tree and take dips in swimming pools, but we've never seen them do this:

The bear is first observed walking down the hillside and suddenly rolls over before falling onto its back and remaining motionless for a few seconds.

"He's playing dead now," one tourist opines.

Then the grizzly bear starts rolling down the hill, prompting laughter from the tourists

"That is hysterical," a tourist says.

"He's playing," another says.

"I've never seen a bear do this," the tour guide can be heard saying, reiterating later, "You guys are seeing something I've never seen before."

Neither have we … until now.

More from GrindTV

Intel hopes to make trick identification easier with new Curie technology

New Trek Connect program sells Trek bikes direct to consumer

'Kickflips Over Occupation' shows the freeing power of skateboarding in the West Bank