Knowing what you're going to be as a kid.

"When he was five years old, Felix Baumgartner drew a picture for his mum. Twelve years later, when the first man to break the sound barrier unaided had just made his first ever skydive, Baumgartner's mother gave the picture back to him: it showed him floating down to earth, suspended – horizontally, but you can't have everything – from a large parachute. There's a happy, smiling sun beaming down on the scene, and what looks like his family standing on the ground, with drinks, waiting for him to land.

Tom Daley, who became a world diving champion at the age of 15 and has represented Great Britain at the last two Olympics, similarly prefigured his achievement, drawing a picture of himself aged nine. Titled My Ambition, the drawing, which he tweeted after winning a bronze medal in the individual competition this summer, shows him in a handstand on a diving board, with the Olympic rings and the words "London 2012" on either side (London was, at the time, just one among several candidate cities)."