Alien invasion movies are funnier when the aliens lose because of one obvious mistake

I was reading this piece about alien invasion movies, and it made me realize something.

A lot of these movies are not just about humans being brave. They are about powerful aliens making one very dumb mistake.

For me, Signs is still the funniest example. If water is your weakness, maybe Earth is not the best planet to invade.

War of the Worlds has the same kind of lesson with germs. Independence Day has the computer virus idea. Edge of Tomorrow makes the aliens scarier because they actually learn from mistakes.

I think that is why these movies are fun to talk about. The aliens are stronger, smarter, and more advanced, but one small blind spot can ruin everything.

What alien invasion movie has your favorite dumb alien mistake?