TEACHER GAVE TWO HOUR LECTURE, DIDN’T REALIZE SCREEN WAS FROZEN

There’s a video going around of a college professor realizing that he had just given a two hour lecture to his students with a frozen screen. Professor Wang Dong (* Well that’s unfortunate.), an associate math professor at the National University of Singapore, finished his two hour online lecture asking if there were any questions. When no one answered, he clicked something on the computer and the screen unfroze, and a few students spoke up, informing the professor that he had been on mute the whole time. After taking a few moments to compose himself, Mr Wang informed the students he would repeat the lesson some other time.
* Students said they appreciated the two hour nap, and looked forward to another one next lecture.
* Who are the kiss-asses who sat through the whole thing and told him he was on mute for two hours?
* He offered them all automatic B’s if they’d keep it on the down low, but somebody talked.
* ♪♫ Everybody Wang Dong tonight! ♫
* Wang Dong bell / Pussy’s in the well
* His name is a action verb.
PHONE TOPIC: The monumental thing I did that turned out to be wrong.