You know, if three people volunteer for an extra shift of work on a Friday evening, it would help if all of them would show up. Because when one of them never even bothers to show, then I am left holding the bag. I, as the person in charge, am left taking up the slack and trying to salvage a situation where we are suddenly and unexpectedly undermanned.
A shift that was not strictly necessary, nobody had to take it on, it was simply an attempt to catch up and get ahead. Turned into an attempt to scramble and keep afloat due to being shorthanded. I'm sure all of us were thinking there was a better way than this to spend a Friday evening.