In the DVD commentary for the movie version of The Wall
, Roger Waters explained that the scene with the teacher and his wife was symbolic of a lack of communication and pointed out that the teacher took out his frustrations on the students. In the movie, when the teacher grabs Pink's little black book of poems, the one he quotes is their earlier hit "Money." Also in the commentary, Waters admits to having a lot of teachers like the one we see punishing Pink.
Ales - Rialto, CA