Your comment made me immediately think of Real Genius
Chris Knight: Hey Kent... That's your car.
Mitch: Kent, you know you're not supposed to park that on campus.
Kent: You've gone too far this time, Knight.
Chris Knight: [whiny, scared voice] I had help! [points to Mitch]
Kent: You, huh? Well you won't get away with this.Doctor Hathaway's gonna hear all about this. You'll rue the day!
Chris Knight: "Rue the day?" Who talks like that?
Lol, ok now I am officially a dinosaur even here on FR. Ok, I can live with that...I knew the day would come sooner or later. I seriously have no idea what movie you are quoting.