ZAZ

Rumack: Captain, how soon can you land?
Captain Oveur: I can't tell...
Rumack: You can tell me. I'm a doctor.
Captain Oveur: No, I mean, I'm just not sure.
Rumack: Well, can't you take a guess?
Captain Oveur: Well... Not for another two hours.
Rumack: You can't take a guess for another two hours?

Airplane! (1980)