Jessi: I didn't notice when we saw this the first time, but the door they enter for the first Engineer structure? It's circular, like a cervix.
me: Kinda creepy then that a bunch of people are walking into it, eh?
Jessi: No, it makes perfect sense. A bunch of little things go into a cervix and a horrible thing comes out.
This is what happens when you mashup the Prometheus trailer and Toy Story 3.