A massive descendant from the Ice Age locks its horns under a fence, and lifts.
With a toss of its head, the outdoor pen is heaved off the ground. A relentlessly barking dog dances around the monster, careful to sidestep its lethal weight. Noise and energy kick up with the dust when the enclosure soon threatens to collapse. A riptide swirls as a roar drowns the tumult in its own deafening thunder.
"Hello, Wildthing! Hi baby!" Sherron Bridges says as the shaggy head of the buffalo swings past the kitchen doorframe only minutes later.
Deadly horns are inches from her chest as Wildthing walks by, sniffing the air and gently inspecting treasured family heirlooms and furniture. Sherron, along with her husband RC, invites their pet buffalo named "Wildthing" inside the house whenever he wants human companionship. Incredibly, it was her idea.
"Why not? You let your kids into the house, don't you?" says Sherron.
"[Wildthing] loves coming in. I have to make him leave and then he comes back in if the door is open," says RC. "The house used to look bigger before he grew."
It's a safe bet that no one had this in mind when they first sang about a home where the buffalo roam. But likely no one ever thought they'd see a buffalo serving as the best man in a cowboy's wedding either.
"Well, he just sat up there lookin' all nice and pretty. And he held the rings and when he got tired of holdin' 'em, he slung 'em off," Sherron recalls.
"He's actually been real good for our marriage. It's really kept it interesting," RC adds.
Wildthing, technically a bison, has lived with Sherron and RC Bridges in Quinlan, Texas, for the last five years. He's a beloved and frankly startling member of their family.
"I don't think about him bein' dangerous. To me he's just a little baby," says RC.
They began raising Wildthing when he was a calf on the verge of death. His mother couldn't nurse him properly, so RC jumped in with a bottle and soon fell in love with the little bison's fiery spirit. Now six feet tall, and a very healthy 2,100 pounds later, Wildthing and RC have an unshakeable bond.
"He is my best friend. He just melts with love," says RC.
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It is a relationship built on extraordinary confidence -- perhaps, even some blind faith.
"These guys are well over a ton," says Dave Salmoni, a large animal expert for the television network Animal Planet. "They can run about 35 miles per hour, which is faster than a horse. And you picture that coming at you, it's like a small car but worse, because this has horns."
Salmoni, who has worked with bison at Yellowstone National Park, where they have attacked and injured twice as many people as grizzly bears over the years, came with ABC News' "20/20" to meet Wildthing for insight -- and for our protection.
"Bison react aggressively to things that they are scared of," Salmoni says. "That just means you've got a humongous animal with horns and knows how to use him. He's going to start throwing you around."
But RC, 61, doesn't avoid taking this bull by the horns. He has spent his entire career as a rancher and rodeo clown, learning the crucial skills of how to handle fear and to roll with the punches. And there have been many over the decades.