The GoT version of "whats in the box mannn"
Gra o tron 7x07 - Crack - Create, Discover and Share Awesome GIFs on Gfycat
Also, I am strongly leaning toward the theory that the Night King is a converted greenseer and not a typical white walker. We know the children of the forest created the white walkers to fight men. We know they then had to band together to fight the white walkers and push them north, building the wall to keep them there.
What if the children of the forest created the so called Night King by converting a greenseer, one powerful enough to both control others and see the past/present like Bran, into a white walker. He would then use his abilities in a warg-like manor to control the army of the dead and march them north. Where Bran's eyes turn white when warging, his turn blue while controlling his subjects. The other white walkers may even be lesser greenseers capable of controlling smaller troupes. This would tie into the rumor that the nightswatch may have sent sacrifices north in the past.
This would explain the Night King's connection to Bran, as another powerful greenseer. This would also explain the Night King's ability to predict and proceed to lay a trap for the arrival of three dragons. I would further argue that the Night King was aware that the magic embodied in dragons could combat the magic of the wall. Everyone one was giving the show writers crap for how slow he was marching south, but what if it was purposeful, forcing Jon to come north in hopes that Dany and her dragons would follow.
While it does not hint at his motivation, it may hint to Bran's eventual role to play in either overtaking or replacing the Night King.