I think I saw that on “The Critic” (I’m remembering that ‘alternate ending’ in animation)
I had that same thought in the theater, and actually posted it here somewhere on the boards shortly thereafter.
Great minds, and all that.
Here’s a serious one, which I posted in the Revenge of the Sith thread back in May.
HOW COULD GEORGE LUCAS HAVE LEFT OUT THE GENERAL GRIEVOUS FIGHT SEQUENCE!!! I mean, I liked Revenge of the Sith, and I value the first two prequels also, but this mistake seemed like the only flaw in the movie (well, no, many others were brought up, but to me this was all I could think about). I’m not even a Star Wars guy, but I knew that logically by prequel three they might have a multi-armed dude fight w/ multiple lightsabers, and whaddaya know they did! But then George made a grevious error ( :rolleyes: ) by not having him fight, he just gets his arms cut right off and runs and is chased on his stupid circle car and shot and dies.
Obi tracked him down and jumped down in there and it seemed like it was gonna be the most awesome fight ever. The dude had four arms to fight with lightsabers with! And in the Clone Wars cartoons, from what I understand, he kicks mucho Jedi ass, but now he’s been wounded for no plot reason at all except that Lucas didn’t understand that he needed a good ‘primary’ (ahem) bad-guy fight scene like in the first two prequels.
The first two prequel baddies were wimps, too, but they got what I consider fun fight scenes. Grevous’s could’ve been fun, and Lucas buggered it unthinkably. God.
Mace: What ain’t no planet I ever heard of! What language do they speak on What?
Anakin: It’s a planet in the Streinitz 12 system. The Watt language is actually a series of clicks and sputters not unlike the Jawa parlance except…
Mace: Shut the fuck up! I was being rhetorical!
DO NOT CONFUSE ONE CEASAR FOR ANOTHER
It’d be odd to have Tiberius as Caligula strangled himself!
“By Grabthar’s Hammer, 30 points from Gryyfindor!”
“I’ve got this terrible pain in all the diodes down my left side, Mr. Potter”
Thank goodness I’m not the only one to think of that. Although saying it in the middle of a screening of the special edition got equal amounts of laughs and "sshhhhh!"s. (I think I posted this in a thread of “What’s the best MST3K you’ve ever done?”)
Something from the same thread: In the wedding gift scene of Fiddler on the Roof, someone really needed to shout, “Tell them what ELSE they’ve won!”
I’ve been trying to think of one for the Princess Bride, but I must conclude that they did not miss a step at all in that movie. When the opportunity presented itself for a good line, they took it. “You ARE the brute squad.” “Fezzik, tear his arms off. – Oh, you mean THIS gate key.” Ahh… Can anyone think of one for this movie?
“The Critic” may indeed have done it, but SNL did it first- Jon Lovitz was Mr. Potter in the SNL skit, which aired just two weeks after my brother asked me “You think Uncle Billy ever remembered what happened to the money?”
Satchmo- I am sure that hordes of ST:G audience members were mentally tossing out A Clockwork Orange lines all through that movie- especially “Come and get one in the yarbles”- I know I was! 
What color horse was Doc Holliday riding?
Some puns that would have improved episodes of Doctor Who:
Brain Of Morbius : << He should have quit when he was a head >>
Hand Of Evil : << Doctor, living stone I presume >>
End Of The World << … which goes to show that it ain’t over til the flat lady singes >>
One of my favorites (which was posted by another person on the SDMB, not me) involves the scene at the end of Star Wars Episode 2: Attack of the Clones. It’s where Anakin and Obi-Wan just got beat by Dooku in a saber-fight. Yoda shows up and should have said… “Kick your ass, I will.” I laughed for a bit when I read that one.
Another is from the scene in Signs, where the alien has captured Mel Gibson’s son, and is holding him, spraying him with alien AsthmaCloud out of his fingers. Mel should have screamed… “Give me back my son!”
A bump, because someone nailed an opportunity! In the Grim Adventures of Billy and Mandy Christmas special, they have Malcolm McDowell playing a vampire. In one scene he’s brushing his teeth and singing Singing in the Rain! (Those of you who’ve seen A Clockwork Orange will know why this is so funny.)