Prudence has long been a student of human nature - fascinating if frustrating and occasionally completely mad.
However there are some things that are quite clear and logical and - above all - obvious.
This truth one knows to be self-evident: if a person looks pale and wan and is struggling with the day, jollying her along is only going cause offence.
So the two colleagues (two!) who felt that saying "smile!" to Prudence yesterday, as she struggled with the day, really deserved the snappy telling-off they copped.