Well, the comment about Flo has gas. Then there is the "I'd give my left two lug nuts" comment by mater. Then of course the whole McQueen and Sally sitting in a tree sing song that mater does.
I have no less than 4 copies of that movie all scratched and unwatchable at different points in the story, so if I go to intermission a couple times during each viewing the whole movie can be seen from start to finish.