...well, it depends on who you ask. The popular consensus is that it's the trailer for Alien. Do I agree? Well, if you check out my article on the most effective trailers of all time (found here), there's also my list of my own favorite trailers of all time, and I have Alien at #2, not #1. My choice? You'll just have to read and find out, but feel free to post your picks for some of the best trailers ever right here!-Thoughts?