Two trailers with the exact length in time, their audio is swapped and synchro magic occurs.
Here is the Social Network trailer visuals with the Let Me Go Audio, then the Let Me Go visuals with the Social Network audio.
There was no editing at all, just a hard replace of audio.
There is some deep commentary here about clones and being a clone, but I let you make your own conclusions.
I create this to illustrate the power of audio to move the visuals and vice versa.
I always say half of the picture is the sound.