Late 1970s grammar school aero club tour of RAF Coningsby. Our teacher says to the small and very nerdy group of budding RAF teenage wannabes "now for christ's sake don't any of you buggers ask any stupid questions". If only I had listened.
A flying officer is giving us a tour around a hangared FGR2 when yours truly spies a couple of drop tanks lying off to one side.
The following exchange between myself and the FO remains etched in my memory.
"Excuse me sir !"
"Err yes, what is it"
(Clears throat) - "well sir, I was wondering what exactly is the capacity of those drop tanks in gallons ?"
"This is the RAF sonny, we drink and piss in gallons, fuel is measured in POUNDS"
I never lived that down, and also managed to fall asleep during the briefing about head-on attacks with the AIM-7.