It's always a toss-up between the first and second, isn't it. I'd say Aliens is my favorite, but it's a hair's breadth of difference. My actual controversial opinion is that *all* of the Alien movies are good (except AVP 2).
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"Another day, another Doug."
"I'll fight you on one condition. That you lower your nipples."
" 'Tis a lie! Thy backside is whole and ungobbled, thou ungrateful whelp!"