The Man Who Stole the Sun (1979)
[On their way to appease a hostage-taker.]
Yamashita: You're a teacher? What do you teach?
Makoto Kido: Science.
Yamashita: Hm. I don't think science isn't going to help us right now.
[Writing a long, complex formula]
Makoto Kido: ...and thus, acidic plutonium becomes plutonium metal. Any questions?
Student: Yeah... so, making atomic bombs is going to be included on the exam?
Makoto Kido: ...the exam?
Other Student: Well, if it isn't, could we move on to something else, please? We're the only class still on this!
[Phoning in a bomb threat]
Makoto Kido: I'm going to return what I stole -- although I'm going to return in a slightly different form.