25 Things You Didn't Know About Die Hard With A Vengeance

15. ...And He Was Even Detained By The FBI For Knowing So Much About The Federal Reserve

If there's anything you'd expect a Die Hard film to be, it probably isn't educational. Even so, the third Die Hard film features a pretty inventive heist element that reveals that Fort Knox might not be all it's cracked up to be, with the New York Federal Reserve actually hosting more bullion than Kentucky's Fort Knox, one of the most famous gold reserves in the world.

Incredibly, Hensleigh was actually detained and questioned by the FBI after completing his script for Die Hard. The agency were evidently alarmed by how much detail the writer put into the film's heist, despite the information all being made public in a New York Times article years earlier, which formed the bulk of Hensleigh's research.