10 Horror Movie Secrets They'll Never Tell You

10. What Was The Baby Made From? - Eraserhead

David Lynch is fiercely protective of his films' integrity, and perhaps the best-kept secret from his entire back catalogue? What the hell Eraserhead's deformed child prop was made from.

In Lynch's mesmerising debut, protagonist Harry (Jack Nance) is left to care for his swaddled mutant baby, whose unique physical appearance has left many speculating about how Lynch created it ever since.

Lynch hasn't ever revealed what the child was made from, and was so committed to concealing the truth that he even blindfolded the projectionist who worked on the film's dailies during editing, and also allegedly had the prop buried after shooting was completed.

Over the years, Lynch has made only hilariously vague comments like "it was born nearby" or "maybe it was found," while some have speculated that it was made from either a skinned rabbit or lamb fetus.

While it's incredibly unlikely that Lynch used an untreated animal carcass that would decompose over the course of production, it's quite possible that he had the prop - nicknamed "Spike" by star Jack Nance - modelled from a dead animal.

All the same, Lynch has managed to keep the secret alive for over 45 years, so there's no reason that he won't be able to take it to the grave with him.