Sequel #20 - The last one for awhile

"You see, I've discovered his weakness. He cares. He actually cares for these Earth people."
"Like pets?"
"I suppose so."

Update: Yes, it's from Superman II

Sequel #19

"The ground, it's all metal. It's full of holes. You know, holey. "

Update: Wow, that was quick. Yes, the correct answer is "Batman Forever".

Sequel #18

"Well it's true! You're semi-evil. You're quasi-evil. You're the margarine of evil. You're the Diet Coke of evil. Just one calorie, not evil enough. "

Update: It was hard to find a clean quote, but it is from Austin Powers: The Spy Who Shagged Me.

Sequel #17

"Hide the rum."

Update: This was voted on Netflix as one of the best line deliveries for 2006. The full quote is:
"Elizabeth!"
(then Jack Sparrow turns to someone and says under his breath)
"Hide the Rum"

From Pirates of the Caribbean: Dead Man's Chest

Sequel #16

I think this should be an easy one:

"Hasta la vista, baby."

Update: OK, maybe not so easy. Another clue:
"Of all the would-be fathers that came over the years, this thing, this machine, was the only thing that measured up."

Update: I only just received notice that Mrs. Ham got it correct on Friday. The correct answer is Terminator 2: Judgement Day.

Sequel #15

"Don't tell me, you're from outer space."
"No, I'm from Iowa. I only work in outer space."

Update: Another clue....
"Your use of language has altered since our arrival. It is currently laced with, shall we say, more colorful metaphors, "double dumb-ass on you" and so forth."
"Oh, you mean the profanity?"
"Yes."
"Well that's simply the way they talk here. Nobody pays any attention to you unless you swear every other word. "

Update: Congratulations, Kat. You got "Star Trek IV: The Journey Home"

Sequel #14

"Hector Savage. From Detroit. Ex-boxer. His real name was Joey Chicago."
"Oh, yeah. He fought under the name of Kid Minneapolis."
"I saw Kid Minneapolis fight once. In Cincinnati."
"No you're thinking of Kid New York. He fought out of Philly."
"He was killed in the ring in Houston. By Tex Colorado. You know, the Arizona Assassin."
"Yeah, from Dakota. I don't remember if it was North or South."
"North. South Dakota was his brother. From West Virginia."
"You sure know your boxing."
"All I know is never bet on the white guy."

Update: Another clue...
"Go ahead, threaten me like you have the American people for so long! You're part of a dying breed, Hapsburg, like people who can name all fifty states! The truth hurts, doesn't it, Hapsburg? Oh sure, maybe not as much as landing on a bicycle with the seat missing, but it hurts! "

Update: Close enough. The full title is "The Naked Gun 2-1/2: The Smell of Fear."

Sequel #13

"How convenient. Enter omniscient monkey, right on cue."
"Well, you know what they say: "When the student is ready, the teacher appears.""
"That's it. No more fortune-cookies for you!"

Update: Another clue:
"Try this - hot tuna frittata."
"Hmm. No, that's not it."
"The spinach armada."
"Quiet, ______. I'm trying to think."
"A spoon of ricotta."

Update: Yes, it's The Lion King 1-1/2. This is one of the few direct to video sequels that was acutally worth watching. It is almost a parody of The Lion King, which makes me wonder how the filmakers got away with it. Here is the entire "Hakuna Matata" sequence.
Timon: Such a wonderful phrase. It had this rhythm. Laduda Ladada.
Pumbaa: Try this - hot tuna frittata.
Timon: Hmm. No, that's not it.
Pumbaa: The spinach armada.
Timon: Quiet, Pumbaa. I'm trying to think.
Pumbaa: A spoon of ricotta.
Timon: Two words.
Pumbaa: A wormy piccata.
Timon: Six syllables.
Pumbaa: Kahuna colada.
Timon: Twelve letters.
Pumbaa: A blue enchilada.
Timon: Rhymes with...
Pumbaa: Legumes on a platter.
Timon: Think, think, think.
Pumbaa: This oughta be hotta.
Timon: I forget.
Pumbaa: I gotta lambada!

Sequel #12

"Dude!"
"What?"
"Hell sucks!"
"Yes really!"

Update: Very good. A newcomer got "Bill and Ted's Bogus Journey" (with an assist by Jason). Here's another quote from it:
"You are most worthy of your reputation- plus you have an excellently huge Martian butt!"

Update: For the quote challenge in the comments, I am going to assume it is a sequel. The only 'rock' related sequel I can think of is Wayne's World 2.

Sequel #11

"You know whats gross, guys that don't wear bellbottoms... yecch."

Update: Another clue:
"You see, a deck consists of 52 cards, and if the hearts didn't work with the diamonds and the spades with the clubs, then how the heck would we ever play a game of Gin Rummy? So, in keeping with the spirit of togetherness, I'm sure you kids know the right thing to do. "

Update: A clue with a character name in it.
"Dad, I think I hit him in the head with these. I'm sorry, Mr. Phillips."
"Peter, drumsticks are not toys."
"Oh, they're not drumsticks, Dad. They're weapons."
"Well, weapons are not toys either, Peter."

Update: The correct answer is indeed "A Very Brady Sequel"

(and for the quote challenge in the comments, I believe it was from Army of Darkness)