What do movie villains do wrong?

The villain almost always lose (except in MegaMind).

Monologuing

Now, I realize that if they stopped monologuing, the audience would never appreciate the cleverness of their fiendish plans. Do you think they'd get away with it if maybe they didn't lay out all the details to the superhero and then inexplicably leave the room to give them time to foil the plan?

Bombs

Also, if their tiny-but-impossibly-powerful bombs that have a bright, blinking LED and annoying bleeping sound, and are always stuck to the front of the rocket fuel tank maybe was completely silent with no visible countdown clock - maybe the hero would never know the bomb was there.

Needless Violence

So you're a villain, you want to take over the drug trade in Gotham. One secret of stories in general, and movies in particular is that you show the evil guy doing something evil early on so the audience knows he's evil. There is no need to show a villain killing someone, hitting children, kicking a chicken, and using foul language over and over. And if you're trying to fly under Johnny Law's radar,

Do you know what happens when you start piling up dead bodies like cordwood? Yeah, the police start sniffing around. It's bad for business.

In Conclusion

If you're writing a villain, maybe try making them at least a little smart, and consider the real-world ramifications of their actions. Trust your audience. They're not all 9 year old children who need to be hand-held through your story.

What do movie villains do wrong?
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