I mostly knew what was going to happen generally in each movie. But, there was a few moments.
Alien: When Dallas was looking for the Alien and it popped out. (even though the chestburster make me a little sick)
Aliens: Um........nothing. I read the script before I watched it.
Alien 3: The dog chestburster sence. I never expected the dog practally exploding. That poor dog.
Alien Res: How horrible it was.