Given that the asteroid that nearly shattered Mimas (Saturn sattelite) is believed to have been a low speed (still thousands of mph) impact and about 3km in diameter, and the meteor that struck the earth was belived to be about 10km did pretty much what the video showed. I think an asteroid the size of the moon would completely change the entire shape of the earth even if it were travelling at a relatively low speed relative to the earth. If it were moving and tens of thousands of miles an hour and hit the earth dead on as it travels 18.55 miles per second around the sun, it would likely create an explosion so large the moon would likely be destroyed from the shockwave.
We'd all be dead before we could figure out where the big shadow came from. We'd be vaporised the second it touched the atmosphere, and the people on the other side of the planet would be crushed instantly as the planet got knocked off it's axis. No worries though, anyone that didn't die instantly would be incinerated a few miliseconds later as the planet disintegrated.
I figure this is basically what you'd be looking at:
Not as flashy as the video, but you get the point.
Everyone would be dead, everything would be molten and incinerated, your car would be written off. And yes, I did make this just for this post, that's the kind of thing that happens when you are between jobs...
Have a good day!
HAHAHAHAHA!!!!!