What kind of things have you seen that are completely mind-blowing?

In the second year of high school, the head teacher hosted the flag-raising ceremony,
and broadcasted over the loudspeaker in front of all teachers and students:
"Before the national flag ceremony begins, here’s a quick message,
Our school’s second-year (3) class teacher, Mr. X,
even after his father passed away, refused to leave his post for mourning,
and continued to face life with a positive and optimistic attitude,
serving students with a smile. This dedication,
this wholehearted, steadfast work ethic is a role model for all of us!"
That teacher was standing right behind me at the time,
and I clearly heard him curse loudly: "CNM"