Why would aliens that water harms invade a planet covered in water?

Signs (2002)

At 1:30:00

Verdict: Guilty. 83% of viewers say this is dumb.

Guilty
83% dumb17% explained

1,500 votes

Dumbness rating

7.9/ 10(1,500 ratings)
Plot holeBreaks its own rules

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What happens in this scene

At the end of the film, a glass of water burns the alien that has entered the Hess house. Earth's surface is mostly water, and the film does not explain why the aliens would choose it. The question is a common criticism of the plot.

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Reviews 2

nopeanut_ninaSupporter9/10Nov 5, 2026

Says dumb

The film's whole threat depends on a substance that covers most of the planet. Nothing in the story explains why the aliens did not know or did not care.

late_to_credits7/10AI rewriteSep 9, 2026

Says dumb

A short line about the aliens being desperate or careless would have been enough. The film treats the weakness as a twist and not as a problem.

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Also asked as

  • Why did aliens invade a planet with water?
  • Is the water weakness in Signs a plot hole?