FUNNY: Humans act like dogs at a dog park

There is nothing particularly unusual about butt sniffing, stick stealing or tennis ball collecting at dog parks.

When it's humans doing this, though, it's pretty darn silly.

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In a video going viral, fully grown men and woman channel their inner canine for a little playtime in the park. They run around the park -- screaming "hey" instead of barking -- intent on finding the biggest stick, chasing the fastest animal and, um ... marking their territory along the way.

In addition to being funny, the video has a sweet ending: It's a PSA to adopt a dog from your local shelter. It was put together by AF2 Pictures, a production company in Minnesota.