It's no longer common now that technology has changed the way if the society. But I still see people gather round to watch if cocks are fighting but this time the fight wasn't stage it just occurred on its own and no one place any bet. They are all there just to entertain themselves.
I once saw bear fighting with dogs. Since I am not the one who enjoys these kinds of activities - so I fainted seeing blood all around. It was very christmas say 10 years ago. I still remember the bitterness of it.
And the worst part is that when the fight is going on you'll see so many people excited screaming meanwhile the animals are fighting desperately to survive.
It's inherent in us we have the animal side of us in the olden days of the gladiators in the Roman era they made slaves fight each other to the death and these are humans, not animals but they are treated as animals we are more savage than animals when it comes to this, in times of wars our savage side comes to defend or assault our enemy, we are both defenders and predators, its something we are born with.