Friday night, I turned on GYC while throwing some photos up on Flickr. Two episodes, one mostly on the '66 Hemi Charger, the other mostly on the '69 RT/SE.
On one of them, Worman did the entire trivia answer segment in his grade-Y Stallone impression, so roughly four minutes of the show taken up with "Urruh ruh ruh ruh, bluh ruh urruh urruh uuuhh." Not actual mumbled words, just "ruh ruh ruh" noises.
(Grade-Z is just saying, "Hi, I'm Sylvester Stallone" in your normal speaking voice.)