Dark Helmet: What the hell am I looking at?! When did this happen in the movie?!
Captain: Now. You're looking at now sir. Everything that's happens now, is happening now.
Dark Helmet: What happened to then?
Captain: We passed that.
Dark Helmet: When?
Captain: Just now. We're at now now.
Dark Helmet: Go back to then!
Captain: When?
Dark Helmet: Now!
Captain: Now?
Dark Helmet: Now!
Captain: I can't.
Dark Helmet: Why?
Caption: We missed it.
Dark Helmet: When?!
Captain: Just now!
Dark Helmet: When will then be now?
Captain: Soon!

Listen to the soundclip for best effect. Taken off the movie Spaceballs.