There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
My father-in-law had a big Herford bull that was very playful. He had cows and hogs. One day his bull got playful with a boar hog. The hog cut the bull's face causing the bull to bleed to death. Being around domestic hogs, I know that it is possible for a big hog to kill a bear or even a tiger. The predator likely, I would think, win more often, but there is no doubt that wild boars are formidable adversaries.
As for a grizzly being playful, the bear and the wolf comes to mind. Can't remember what country they live, but their pictures are popular.