Was told a story by a former Engineering Officer (now sadly passed), who was ground crew on one of the bomber squadrons.
He was leaning in to the cockpit to check the straps etc on the pilots during one of the 'exercises' when all the pens from his top pocket fell on to the floor.
Despite scrabbling around he couldn't find them all.
The crew agreed to keep quiet about it as it would have made their aircraft u/s.
I can't remember how much of his bar tab it cost him though.