15 Insane Movies That Shouldn't Have Worked

10. Watchmen (2009)

Alan Moore's legendary graphic novel was deemed "unfilmable" by director Terry Gilliam, who made two attempts to get an adaptation made, but neither was successful.

Well, Zack Snyder finally pulled it off in 2009, complete with an all-star cast and ludicrous $185 million budget. Snyder may not be the most naturally gifted of filmmakers, but he deserves credit for taking such complex, dense source material and rendering a coherent, well-acted, visually stunning film out of it.

Fans are understandably divided on certain aspects of Snyder's film - namely the decision to remove the giant squid from the finale - but given the immense challenges involved in convincing a studio to fund and release such a tricky anti-superhero movie, the fact it exists at all is pretty incredible.

That it's a stylistic feast with provocative themes is just the icing on the cake, really. It's not perfect, but it's sure proof that, with a worthy script, Snyder is capable of delivering a diverting cinematic experience.

Watchmen ended up bombing at the box office, cementing just how crazy it is that the film got made.