In this age of the internet is is pretty hard for game companies to keep secrets. Sometimes, even trailers get unofficial releases. That was the case with the E3 2014 trailer for Metal Gear Solid V: The Phantom Pain.
So, even though many already saw it, they still showed the incredible new trailer on stage. Viewers got a glimpse at the main characters as a track by artist Mike Oldfield played over various cutscenes.
Unfortunately, since the trailer leaked, it was quickly taken down from every source. Those who missed the trailer initially can take a look at it here: