10 Movie Rules That Make No Sense

M. Night Shyamalan's Signs revolves around an alien invasion on Earth, and concludes with a characteristically barmy Shyamalan twist, that the aliens are actually deathly allergic to water of all things.

Ever since the film's release, fans have questioned why an alien species would dare try to invade a planet where 71% of its surface is covered by the very thing that kills them.

Dumb aliens are one thing, but this perceived "plot hole" actually overlooks the movie's true logical fallacy: the inconsistency of the water rule itself.

Late in the movie, we see that a glass of water severely scalds an alien's skin, and so, considering that there are 37.5 million gallons of water in the Earth's air at any one time, shouldn't the aliens' sheer presence on our planet cause them some measure of discomfort?

Even if you argue the aliens need to be hit with a greater concentration of water in order to be harmed, you'd think the residual water in the air would at least singe their skin if a light spill can make them resemble a third-degree burns victim, no?

Signs is a perfectly entertaining movie up to this point, so it's a shame Shyamalan invites so much second guessing from the audience so late in the game.