The life of an inventor is not an easy one. You have to first come up with a good idea that solves a problem in a way that no one has thought of before, and then you need to design and engineer your idea to take it from theory to reality. But invention is a fickle mistress and has proved to be a dangerous undertaking for many a would-be Edison. Things go wrong, inventions break or don't work as the designers intended, and sometimes inventors are killed by the very ideas they brought to life. We've compiled some of the sad but fascinating stories of seven inventors who died at the hand of their inventions.