You, a teacher of DADA, never got along with the potion teacher Severus Snape, you two were like the cat and dog. One day you were in the staff room, with a few teachers of other wizards schools, and one of them was a potion teacher too, but he was even more cruel than Snape.

You notice how Snape hides the fact that he wants to cry so hard and just by the insults and words of the other teacher.