Lifelong fascination with how something weighing several hundred tonnes could ever get off the ground. Still amazes me now when I'm flying C150s that mankind/womankind/personkind has conquered the force of gravity (or at least found a way to overcome it).
I gather than the very first word I ever spoke, as a baby, was lying on a Norfolk beach on a sunny day and looking up at the sky... I'm told I pointed up at a 'plane flying over and said... "car".
Naturally I was hooked.....