If you happened to watch the Charlie and the Chocolate factory remake, you no doubt noticed the scene where the dozens of highly trained nut busting squirrels attack a small child. Presumably because it’s the best damn scene in the entire freaking movie.
Of course the ones that attacked the small child were CGI, no director is crazy enough to set rabid animals on children, well, maybe Michael Bay. However, the ones you see cracking open the nuts were all real and were all trained to actually do that. Why? Because there were no midgets playing oompa loompa in that movie and god damn it people demanded to see something morally questionable in that movie. If you can’t abuse people, small furry animals are the next best thing.