This is based on Greek mythologie. It's the curse of Cassandra. She predicted the fall of Troy long before it happened but no one believd her and they all died because of it. (because i like to be a know-it-all sometimes)
object lesson about hiding sin. You use a glass filled with coke and drop buttons in it. The glass represents the person and the buttons are sins. At first the buttons sink and you can't see them. Later the buttons start popping up to the top.
How to Sew a Mitred Corner (Tilly and the Buttons)