Crack of Dawn vs Crack of Doom vs Crack

Three of the most famous cracks the world has ever known. Granted, there are others, but for now, we shall stick to these:

THE CRACK OF DAWN

Image by Daveybot via Flickr. So.. shiny...

THE CRACK OF DOOM

From lotr.wikia.com. Yes, there really is a LOTR wiki.

CRACK

What, you were expecting something else?

Without further delay, let’s get crackin’: