You're not Mack.
3 seconds sound clip from the Cars movie soundboard.
You can hear this line at 00:23:21 in the Blu-ray version of the movie.
Quote context
[...]
- Mack!
- Mack! Hey, Mack! Mack! Mack! Mack, wait for me!
- Mack! Mack! Mack! Mack... wait up! Mack. Mack! Mack!
- I'm a Peterbilt, for dang sake!
- Turn on your lights, you moron!
[...]