You got mud in your tires.
3 seconds sound clip from the My Cousin Vinny movie soundboard.
You can hear this line at 00:13:30 in the Blu-ray version of the movie.
Quote context
[...]
- I think you should put it on a rack and take a look.
- Nothing. The car was shimmying on the highway a little bit.
- Mm-hmm.
- Let me ask you a question, how do you get mud into the tires?
- That's just a figure of speech.
- The mud gets around the inside of the wheel, throws the balance off.
- You ever hear of that? Mud in the tires?
- No.
- She never heard of it. She knows everything about cars.
[...]