Place it immediately after the boast or flashback it is questioning, then follow it with a short reaction sound that confirms the doubt. It works best near the end of a Cars-themed edit, just before the punchline lands, with a fail sound or a knowing laugh completing the sequence.
About this sound
This is a very short spoken line from Tow Mater, the rusty tow truck from Cars, delivered in his slow Southern drawl as he questions McQueen about being there too. It feels playful and a little cheeky, like a friend calling out a tall tale with a grin. The line comes from the Cars films, where Mater's good-natured teasing often lands right after McQueen says something grand.