I am reminded of funny site in corridor one day many years ago. Short stout co-pilot (experienced captain on new assignment) holding tall skinny captain by lapels of flight suit whose feet were two inches off the ground (captain was re-tread jet-jock with little helo IFR time) the copilot lectured the captain thus, in aussie tones,
"Listen hear you F****ing Idiot, Cloud starts in the Sky and goes up, FOG starts in the sky and goes down and YOU CAN'T FLY UNDER F****ing FOG.
I think they had just had an intresting flight back to Stavanger from the Ekofisk!