Is there any better sign of commitment from an actor than watching them beat themselves up? This kind of on-screen self-harm can happen in a variety of ways, and they're all a treat to the senses. Actors like Jim Carrey and Bruce Campbell are brilliant at literally fighting themselves, but through digital technology, smart camerawork, or the simplicity of a mask, actors of all stripes are able to beat themselves black and blue.
In this case, let's look at characters who literally fought themselves - not actors who fought themselves when they were playing two characters. This is strictly character-on-character violence. Not every scene where a character beats themselves up is created equally, and not every character is a worthy opponent for themselves. That being said, some of the folks collected here are truly amazing at giving themselves a whooping.
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