My favourite example of this is from the Apollo command module. Margaret Hamilton (one of the programmers) had her daughter in the simulator and let her play a

My favourite example of this is from the Apollo command module. Margaret Hamilton (one of the programmers) had her daughter in the simulator and let her play around. She managed to crash the simulator by launching a certain programme midflight. Margaret wanted to stop this from being possible, but was overruled because astronauts don't make mistakes. Eventually one of the astronauts made that exact mistake during the Apollo 8 flight. Source: https://www.wired.com/2015/10/margaret-hamilton-nasa-apollo/ https://www.wired.com/2015/10/margaret-hamilton-nasa-apollo/