Movie spoilers are one of the many things that the Internet deals in like currency -- once a film has been released, it's tough to avoid having the ending ruined for you unless you power down every electronic device in your home and live like a frontier fur trapper. However, sometimes the movie gives away its own ending (or at least crucial upcoming plot points) by dropping vague little hints early on. You just have to keep your eyes open ...

5 Jurassic Park: A Seat Belt Malfunction Reveals That the Dinosaurs Can Reproduce

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Jurassic Park is a movie about dinosaurs killing people, but several things had to go wrong in order for this to happen. Sure, the security system getting shut down by Newman from Seinfeld was a big one, but before that came the news that the dinosaurs were breeding out of control, despite the fact that it should have been impossible.

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After all, sending kids to a single-sex school always stops them from fucking, right?

This is one of the big twists of the film, when paleontologist Dr. Sam Neill discovers that the dinosaurs are breeding despite the fact that they were genetically engineered to all be female (specifically to prevent this). It is a development that, indeed, no one saw coming, for how in the name of science could a bunch of prehistoric lizards equipped with nothing but girl parts be expected to make babies?

However, if you were paying close attention, it's a twist the movie gives away in the first 20 minutes.

The Foreshadowing:

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It's played as just a throwaway joke -- as the helicopter carrying all the '90s-fashionable scientists swoops down toward Isla Nublar, Neill is told to buckle his seat belt. But then this happens:

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Alan Grant, Ph.D., makes three separate attempts to buckle these together.

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That's right -- Neill is stuck with two buckles, rather than the tongue and buckle combination required to secure him safely to the helicopter bench. The clasp, incidentally, is also referred to as the "female" end, so Sam is technically stuck with nothing but female parts. He continues fumbling around with the mismatched seat belt while Jeff Goldblum stares him down like a guy who knows a thing or two about female parts: