There's something in the water at the Minnesota DNR fish pond at the Minnesota State Fair, and officials aren't happy about it.

For the second time this year, people have jumped into the pond and taken a dip with the walleye, pike and sturgeon circling its depths.

"It's not designed for human swimming. It's for the fish," said Steve Carroll, DNR spokesman.

State Fair police said the last time anyone was discovered navigating the waters was five or six years ago.

"It's usually done on a dare," said Brooke Blakey, police spokeswoman.

That was the case Friday night just before midnight at the Fair, when police got a call about a guy in the pond.

"The report says, 'followed a wet set of footprints leading to the suspect,' " Blakey said.

The man and his group of friends were banned from the Fairgrounds the rest of the year.

Police were unaware of the second incident until a reporter alerted them to a video posted on Instagram, an image-sharing site.

In the video, posted Sunday night, a young man in a University of Wisconsin basketball tank top looks into the camera and says, "It's happening now. It's happening now."

The camera pans across the crowd looking into the pond, which is surrounded by staggered wood pillars. A sign reads, "Danger. Do not climb fence. Water depth four feet."

The young man changes into shorts. The video shows two police officers standing nearby. Finally, the young man takes a short run at the fence, whoops and somersaults over, landing in the water on his back.

Several whoops arise from the crowd.

Apparently, he was able to get away from the pond without being stopped. But that doesn't mean he got away.

"It's being investigated. We don't advise that you do that because there will be repercussions," Blakey said.

More than that, it's not safe.

"He could have broken his neck," she said.

The Pioneer Press was unsuccessful in contacting the man shown in the video.