In one of the best books ever written about wartime Bomber Command, Jack Currie's
Lancaster Target, he describes an incident involving one of his gunners being taken short and asking to leave the turret in order to resolve the problem....
A little devil crept into Currie's head and he told the gunner that they were still in a hostile area, so he had to remain in the turret for the time being.
A while later, he relents and advises the gunner that it is now safe to leave the turret in order to do the necessary.
"No worries, Skipper - it's frozen", came the reply....
In more recent times, a certain Victor pilot (who may or may not have been known in his later VC10K days as 'Logger' McD***s) had occasion to use the Victor's V-bomber ration box for an unintended purpose on, one gathers, more than one occasion...
Which can't have been much fun for the rear crew.