Bison, meet jackass.

A bozo was captured on cellphone video taunting a large bison in Yellowstone National Park this week.

In the less-than-1-minute-long online clip taken Tuesday by bystander Lindsey Jones, a shorts-wearing man beating on his chest is seen approaching the ungulate on the two-way road in Hayden Valley.

The bison — which can weigh up to 2,000 pounds and stand 6 feet tall — is having none of it and promptly charges at the man, video posted to YouTube by KRTV News shows.

“Oh God, I can’t watch,” a person can be heard saying in the video as the bison charges the man for a second time.

Another person can be heard imploring the man to “Get out of there!”

The man and the bison go their separate ways before the clip ends.

In a warning message on the National Park Service’s official website for Yellowstone National Park, it says, “Wild animals are unpredictable and dangerous.”

“Every year people are injured when they approach animals too closely. Animals that attack people may need to be relocated or killed,” the website says.

The National Park Service advises that visitors “always remain” at least 100 yards from bears or wolves, and at least 25 yards away from all other wildlife.