Frog can't make the meeting that Mary requires him to cover because he's supposed to be going to another meeting that Policy Team require him to go to. Except that he can't go to either because he's got to go and cover the children's event at Umpty so that somebody else can go to the latter meeting. Except that that meeting's now cancelled, but Frog still has to go out and provide the cover.
Just to cheer him up I show him a posting on the public libraries discussion list detailing a not-all-that-big-really library authority's children's library team structure, including the Early Years Librarian, the Teen Librarian and more. His response was rich and Anglo-Saxon.