With the exception of Jeff Goldblum's bare, oiled-up chaos chest, the big stars of Jurassic Park are obviously the dinosaurs. However, according to one oddly convincing fan theory, there has never been a single actual dinosaur in any Jurassic Park movie. The "dinosaurs" John Hammond, Samuel L. Jackson, and the bad guy from The Substitute 2 created weren't resurrected from ancient dino DNA -- they were actually brand new creatures cobbled together using DNA from non-extinct contemporary animals.
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The whole "dinosaurs back from extinction!" thing was just a P.T. Barnum-esque stunt to fool gullible tourists.
Why It's Not That Crazy:
The originator of this theory appears to be Redditor Brownra04, as far as we can track it down, and it goes like this: The entire premise of Jurassic Park centers around the idea that geneticists were able to extract dinosaur DNA from prehistoric mosquitoes trapped in fossilized chunks of tree sap, which is impossible, because DNA has a half-life and would have decayed beyond any possible use after 65 million years. Plus, there's no way you would find a mosquito who limited its blood intake to one particular species of dinosaur. There would be hundreds, if not thousands, of different DNA strands in each mosquito. Every DNA extraction would be like taking a cotton swab of a college freshman's bedsheets.