Simple words that start a war: "Good morning. My name is Miss Barrett. I am your Home Room teacher..."

Up the Down Staircase (1967)

Directed by Robert Mulligan

Sylvia, a novice schoolteacher, is hired to teach English in a high school, but she’s met with an apathetic faculty, a delinquent student body and an administration that drowns its staff in paperwork. The following days go from bad to worse as Sylvia struggles to reach her most troubled students.