have you ever noticed how every person who described a so-called alien face from their encounter has eyes in the front of the alien face? this is the position of the eyes that predators have as opposed to prey which places eyes more to the side allowing a wider degree of vision, as a defence, in order to detect and flee from oncoming predators more quickly. so then, if even one of these alien descriptions is accurate, it would show that aliens are of a predator species and we may, in some fashion, be their prey.
i still think if ufos do exist, they are more likely to be humans from our future rather than creatures from outer space.
http://youtube.com/watch?v=X02WMNoHSm8