Name your biggest plot holes. (spoilers by necessity)

[akiratubo]

I'll start with the biggest one I can think of offhand.

In the new Star Trek, once he got sent back in time, why didn't Nero go to Romulus and warn them about the supernova that was going to destroy them in the future?  Given that he and his crew were obviously Romulans from the future, who were crewing a giant ship that was obviously from the future, I doubt he'd have had much trouble convincing them.  Hell, by copying that ship and its advanced weapons, Romulus would have been a century or more ahead of the rest of the galaxy technologically almost overnight!

"He was too obsessed with killing Spock," doesn't cut it.  He -- and the members of his crew, mind you -- had 25 years to think about it before Spock came through the black hole.

Huge HUGE plot hole that completely undermines and makes a mockery of the whole movie.

Name some others.

[InformationGeek]

The biggest one I can think of off the top of my head comes from the remake of The Stepford Wives in which the woman is part ATM, giving us the impression that she is a robot.  Later we learn that all the women just have microchips in their heads, so how this happens is anyone's guess.  My theory is that there were two verisons of the woman, a robot and the real one.

Another is the shark from Jaws 4.  We get no real reason for why the shark is attacking the Brody family in the movie.  It can be for revenge purposes since all three sharks were killed in the previous movies.

Then there is Wanda from The Phantom from 10,000 Leagues.  There is no given reason for why she wants the data and research from Prof. King in the movie.  My personal theory is that she is a rival scientist from another lab trying to steal the research for her own use.

The final is from Octopus 2.  There is no good explaination for why the octopus arrived in the area or why it is so big.  We just to assume that a random gigantic octopus just randomly happen to float into the river.

I could go on, but I would need some more time.

[Bmeansgood]

Vampires v. Zombies.  I don't think the movie had a plot. 

[AndyC]

Fantastic Voyage. They left the submarine inside the patient. Sure, the sub and Dr. Michaels were swallowed by a white blood cell, but they were still in there. At the same time the heroes were returning to normal size, Benes' noggin should have exploded in a mess of gore, sub wreckage and bits of Donald Pleasence in the next room. I can suspend disbelief with regard to miniaturization, but even as a kid, I could see a huge problem with just leaving the sub behind. Reading the novelization years later, it was good to see that Asimov, God bless him, tried to sort that out, even if the best he could do was have them tease the corpuscle until it chased them to the eye.

[LilCerberus]

Horror Hayride
If the mobsters hired an art-snot like Briley to give their porn company "a touch of class & take a step towards something more legit". then why didn't they try to make some money off the art film he produced? Enough people seemed to like it.
And, if Briley's "genius" was his excuse for turning a driver's ed movie into a goresploitation flick, why couldn't he apply the same logic to skin flick the mobsters wanted? Maybe meet them halfay? (There's only one reason I sat through "La Belle Noiseusse".)

Huntress: Spirit of the Night
(Plot? What plot?)
It's plausible that Tara wouldn't remember getting possessed, but wouldn't she at least be wondering what happened to her dress?
And, why would "The Spirit" make her forget to wash her feet, but remember to put on her nightgown?
Also, Ty Bodi's story of the town curse is fairly reasonable, but when he admits to murdering the possessed women, he cites some prophesy, but not who made it.
And, how is it that none of the women in town know about the curse & how it's dealt with, while all the men in town are in on it.
And, why does the town murder the possessed women, rather than call an exorcist, especially when they know that the more women they kill, the more "The Spirit's" just going to keep jumping from one woman to another?
And, why didn't Ty Bodi give Tara the rosary before she got possessed?
And, how could her boyfriend Jacob not notice the black contact lenses?

[Jack]

Wrath of Khan - in the Mutari nebula, the Enterprise and the Reliant are having their big shootout.  The nebula somehow effects the sensors, so the big TV screen on the bridge only barely works.  However, in the exterior shots, everything looks crystal clear, so apparently it's just some electronics interference.  And the ships seem to usually be less than a mile or two from each other.  Um, guys?  Did you ever notice your starship is covered in windows?  Yeah, you could look out those and spot the enemy ship.  Guess that never occurred to you.  Shame Spock, shame!

[AndyC]

The thing that bugged me was that when the Mutara Nebula condensed into the Genesis planet, it was suddenly in orbit around a star that wasn't there before.

[El Misfit]

in 20 million miles, taking the ymir of its planet was harsh!

[LilCerberus]

The Wizerd of Mars
If previous attempts to break in to the Martian vault met with disaster, why were the astronauts able to do it?
And, what use was their terrain map underground?
And, how were they able to adapt at tiny cylender of liquid oxygen with a busted valve to their air tanks without tools?
And, how did they go to the bathroom?

[lester1/2jr]

in help help the globlinks the aliens are repelled by music.  but it's an opera, so everyone is singing!!

[Flangepart]

In THE GIANT CLAW, why diden't the heros conceder the value of camoflage and silencers when they went after the monsters eggs?

[Allhallowsday]

In I AM LEGEND, we are clearly informed, and in flashback shown, the destruction of bridges that offer escape from Manhattan.  If the military is at the desperate point of rocketing the Brooklyn Bridge in order to destroy it and prevent the infected from escaping quarantine, surely they also would have blocked off or destroyed the Lincoln Tunnel or the Holland Tunnel, or the George Washington Bridge, etc, any and all egress from Manhattan.  Okay.  But that leaves me wondering how Anna and Ethan got onto Manhattan, and driving their own car no less...

[El Misfit]

in taking of phelom 123, why not using the heli to transfer the 10 mil

[Chargers Fan]

In any Star Trek story in which the Borg are being fought man-to-man, the good guys always have to deal with the Borg's ability to phase-shift (or whatever), which renders phaser fire useless after the first shot or two.

Uhhh...maybe this is simply too primitive for characters in that setting to think about, but why not just whip up some good old fashioned shotguns to fight the Borg manually.  Let's seem them adjust to that.

[Jim H]

In any Star Trek story in which the Borg are being fought man-to-man, the good guys always have to deal with the Borg's ability to phase-shift (or whatever), which renders phaser fire useless after the first shot or two.

Uhhh...maybe this is simply too primitive for characters in that setting to think about, but why not just whip up some good old fashioned shotguns to fight the Borg manually.  Let's seem them adjust to that.

This is particularly made into a mockery when in First Conctact, Kirk blows away two Borg with a TOMMY GUN.  Ya know, they have REPLICATORS to make that stuff easily.  In another scene, Worf kills a Borg with a klingon KNIFE.  Yeah, it's an unending gaping hole of logic.