I cried when a student of mine committed suicide. I remember not the confusion it caused a lot of students and teachers. (mostly her middle school teachers as it happened after 3 days of high school). I remember trying to understand the act and remembering how she had changed from that kid who used to like to eat lunch with me and play with the class hamsters and frogs.
But still to this moment that is the worst experience I have had in my profession. Since then it has happened two other times..I learned to deal with it a lot better now.