Least Likely Theories

Given all the theories flying around about what is going to happen in the film, I thought it might be a good idea to have a thread where we can narrow them down starting with the ones least likely to be true. What are your thoughts about which popular theories on this board are unlikely to be the real deal. My personal choices for things least likely to happen in Prometheus are: 1. David's head becomes the Xenomorph 2. Weyland is somehow going to turn into the Space Jockey or steal the alien ship (all evidence points to the fact that he is not even on the Prometheus in the first place but is just funding the expedition). 3. That the tentacle thing is a decapitated Space Jockey that is feeding off the genetic information of the crew and turning them into Engineers. 4. That Prometheus will have blatant references to Aliens, Alien 3, Alien Resurrection, and even AVP. 5. That the Xenomorph will make an appearance.