When I was 7 I was utterly spellbound by the Apollo 11 mission to the moon. I embarked on a project to build an Airfix model of the Apollo 11 Saturn V rocket. It took me hours and hours - it was very detailed model. Then I decided I wanted it to actually take off....so I packed an old Airfix paint tin with a thing called 'Jetex' (a solid rocket fuel for models you could get at the time) and glued it into the base. On the big day I set the model up on a stand in the garden, and with huge ceremony lit the Jetex motor and ran back into the house. There was a vast amount of smoke, and when it cleared...nothing had happened. No big takeoff. I still smile when I remember returning to the rocket and finding the whole base of it had melted. Such enjoyment - the excitement, naivety, and hope of childhood.