10 More Movie Idiots Who Basically Created Their Own Villains

7. Stark And Banner Learn Nothing About The Mind Stone - Avengers: Age Of Ultron

SHIELD obviously have previous of redeveloping weapons they've acquired from their enemies, given that they stole HYDRA's weapons technology to make anti-Thor weapons in secret, but that doesn't mean it's always a good idea.

You'd think that Bruce Banner and Tony Stark would have the shared brain power to realise that if you use a mystical alien artefact that you've previously seen body-snatch both a fellow Avenger and basically the most experienced astrophysicist on Earth, you're asking for trouble.

And yet, when it comes to exploring how to create Ultron, the pair completely fail to realise that there's probably a reason that it was impossible initially and then also recognise the danger of basing ANYTHING on what they learned from Loki's Scepter. But no, they plough ahead and the inevitable outcome is a sentient AI with an in-built passion for Avengericide.