A Cassandra Day (n.)
1) One of those days when you spend all day running around telling people things will go wrong and are then ignored only for your predictions to come true.
From the myth of Cassandra, the only person in the entire story of the Trojan War who was completely blameless and didn’t deserve to die. She was cursed so that her powers of prediction were useless as everyone always ignored her. Fortunately a Cassandra Day does not result in the death of the person having it at the hands of their lover’s wife.
Note how in this painting of Cassandra she is pulling out her hair. That’s what a Cassandra Day feels like.