Never caught short personally but there is a lovely story around Ark's last East of Suez cruise. One pilot had a skin full heading through the Med and threw up over the side of his bunk. In the morning, he was surprised not to find his supper on the deck but assumed he had cleared it up and not remembered.
8 months later, passing through Gib, with the sea temp dropping, he went to put on the goon suit that had been hanging next to his sink - and put his foot in it!
Similar story when doing QRA in the Falklands and 'Bondu' the 1435Flt cat (and chief rat/mouse catcher) pee'd into one of the crew's goon suits that we used to leave on the floor in the corridor for quick access and plenty of room to put on (the rooms were a bit pokey). During one scramble the pungent essence of 'tomcat' was apparent as one unlucky sole had to put on his goon suit and fly in it for a few hours!
LJ