In The Simpsons Movie, Flanders says this to Bart when Bart comes into the church.
How good to see you. And how terrible you're here.
I am not familiar with this usage of how here; as unfamiliar as I am, I couldn't not think it meant Flanders felt terrible that Bart was there. I assume, as Bart is not a church-going boy, that it actually means Flanders could see how terrible the things are going; "it must be terrible that you've come here." Could you tell me how it's used and give some examples? And is this common?