The "aliens" are severely burned by tap water, acting exactly like holy water against demons.
Film/Series: Signs
Category: Trivia Fact
Timestamp: 01:25:10
A popular fan theory suggests that the creatures in M. Night Shyamalan's film aren't extraterrestrials at all, but rather demons. This explains why they are repelled by simple water—if the water is considered "holy" due to the protagonist's daughter, it burns them like acid. This subtext transforms a sci-fi thriller into a theological battle for observant film detectives.
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