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It's hard to blame someone for wanting to make something look as awesome as they imagine, but sometimes having that "sky's the limit" freedom means knowing when to keep it grounded. It's advice they needed to heed in Terminator Genisys, when the T-1000 slices off its own arm to then use as a javelin:

Paramount Pictures

What seems like a fun little CGI flourish ends up opening a world of impossible character motivation and baffling physics. Why would a thoughtless killing machine waste precious murder-seconds dramatically lopping off his own spike and flipping it into the air like a futuristic baton twirler? How did it even manage to perfectly spin its amputated dagger arm like that? Is it wise for a liquid-metal robot to willingly javelin his body parts? What if he loses the piece? Won't he keep getting smaller with every new one he loses? The director probably didn't ask any of these questions, because he just wanted this shot to look cool. It's the exact same problem later in the trailer, when the T-800 goes tumbling into traffic:

Paramount Pictures

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It took me forever to figure out why this shot looked so wrong, until realizing that the one-ton robot flying down the highway somehow manages to lightly flip and bounce like a two-pound puppy. The obvious explanation is that the director needed Arnold to end with his face through the windshield for the hilarious little gag that happens next, and accomplished this by throwing out everything we know about gravity and inertia in the process. It's yet another case of an object or person going where the director needed it to go, instead of where it naturally would. And while many movies these days actually hire physicists to tell them if they're punching Isaac Newton in the taint, that advice is meaningless if you're using CGI to pull off an entire stunt instead of trying to perform it in the real world.