Leonardo da Vinci, being the sketch book fiend that he was, invented a helicopter. Clearly the man had far too many ideas, and not enough time to make them all. (The experts think it would have worked, by the way).
The other day I was stuck in traffic on the A3 in London, and I thought… If Leonardo had been stuck in traffic on the A3, he would have made damn sure that he had time to build that helicopter, and get it working.
Come to think of it, he would also have sued the ass off Dan Brown for writing the bloody DaVinci Code.