Planes, Trains & Automobiles (1987)
Michael McKean: State Trooper
State Trooper : What the hell are you driving here?
Del : We had a small fire last night, but we caught it in the nick of time.
State Trooper : Do you have any idea how fast you were going?
Del : Funny enough, I was just talking to my friend about that. Our speedometer has melted and as a result it's very hard to see with any degree of accuracy exactly how fast we were going.