Just like he secretly created a suit of armour to take down Thor, Iron Man also stole one of the God of Thunder's hairs the first time they met (he lifted it from one of the chairs in Avengers Mansion). Years later when Thor was still missing in action, Tony Stark, Hank Pym, and Reed Richards cloned his DNA and created a new Thor who was a mixture of God and robot. He couldn't be controlled however and killed Black Goliath during the Civil War. Hercules later destroyed him - "THOU ART NO THOR!" - and the returning Thor gave Iron Man a thorough beating for having the audacity to create a deranged clone of him.