The xenomorph's life cycle is a convoluted, not particularly logical sequence of necessary conditions that would make Darwin wonder how this thing is still around. But even if natural selection isn't its strong suit (you need a queen and
a steady supply of host bodies?) it certainly knows how to make a fantastic entrance. The first but not last shocking burst of sudden violence on this list is an image that was burned onto our collective psyche, as an infant alien pulled a ''Heeeeerrrre's Johnny''
on John Hurt's ribcage.