10 More CGI Movie Shots You Never Noticed

10. Falling Objects On A Train - Mission: Impossible - Dead Reckoning

The mighty Tom Cruise prides himself on very much diving head-first into just about every practical stunt possible during the shooting of any of his movies. And sure enough, Mission: Impossible - Dead Reckoning once again saw Cruise driving a motorcycle off a cliff, running/fighting on the top of a train, and hanging onto the inside of many of said vehicle's carriages as it dangled off a bridge for real on-screen.

However, just because these moments often required the Hollywood superstar and his co-stars to do some entirely practical stunt work doesn't mean that the whole scene was free from digital assistance.

Take that aforementioned many falling carriages sequence, for example.

While Cruise and Hayley Atwell were definitely scrambling their way up the vertical carriage - with the two being connected to wires as a practical rig of the train was flipped - you likely didn't notice that a bunch of what you saw here is actually CGI.

As revealed in a fascinating Industrial Light & Magic Behind the Magic clip, everything from the location seen outside the windows, to the moving curtains, to just about every piece of furniture that dangerously drops down next to Ethan Hunt and Grace were all digital. 

And that piano that dramatically plummets out the back of the carriage? That was computer-generated, too, making an already thrilling sequence that little more impressive when you realise just how much of it was brilliantly added into the scenario digitally.