A young US Air Force recruit rung his father after a tiring day:- 'Dad, I don't think I'm cut out for the Air Force.' 'Why's that son?' 'Well, I was in the plane today, doing our parachuting course and I got really scared. The chief told me that if I didn't jump, he'd 'do' me with his '12-incher.' 'Well son,' the father asks, 'did you jump?' The son replies... 'Just a little bit at first.'