I'm worried that the guy who teaches across the hall from me is going to quit.

One of the first things he ever said to me was "I haven't interviewed for a job in 20 years.  People just call me because they want me." I guess he was like a school flipper. He would go into poorly performing schools and flip them and make them better. It sounds like a great reality show to me. One of the second things he ever said to me was "The last school I was at started out in the 5th percentile and ended up in the 75th percentile." Congrats sir. Really, that's impressive.

I guess he thought that meant he knew how to be a teacher?  He's struggling. 

Every day he has a new thing to complain to me about (while we stand in the hall between passing periods).  His classes are too huge, his projector doesn't work, there's no air conditioning, there are stupid kids and smart kids in the same class, the grading takes forever, he can't figure out how much lesson will fill up a class period, the internet goes down on the regular, etc. etc. etc. It's exhausting listening to him because I don't know what to say. Those things are realities. That's just how it is.  You roll with it anyway because that's what teachers do. 

I wonder how he lasted as a school flipper for 30 years without realizing that sometimes people mow the lawn while you are trying to give a lesson and you just keep teaching anyway.