O boy. This looks like a Eurasian Brown bear, the European cousin of the Grizzly. Bears have been trained to perform in circuses throughout history, but there is a reason these practices have been outlawed. Bears are too damn dangerous. This circus was probably taking place in some eastern European nation (Russia probably), and this bear had enough.
It;s crazy to think that bears existed across Europe, even in England, until about 1000 years ago. Knights wearing armor was the level humans had to get to in order to actually beat bears. Yet we are still putting them in circuses after videos like the one above. Mankind is truly an interesting species.
Also, why we shouldn't domesticate bears? This video of the guy on the couch is a pipe dream while the pissed-off circus bear is the reality.