On my GIT course, many moons ago, something like 9 out of 12 attendees were either Buccaneer pilots or F4 navs made redundant by Jaguar and destined for the Nav School.
It was difficult to hold their attention when discussing the Shackleton compass system, but they were most amused by the sole truckie.
A small, fat, mouthy F4 nav called, I think, Chunky, was doing a sea survival lesson. Ignoring all question technique, he simply pinned this Brittannia guy and asked him for the first thing that should be done after boarding the dinghy.
His response?
'Call the roll'.