Lasseter is said to be thrilled with the honour and said the following:
Congrats to John on his first role in a Pixar movie, in contrast all other Pixar directors have already voiced a character (Pete Docter was Kevin in Up, Andrew Stanton was Crush in Finding Nemo, Brad Bird was Edna Mode in The Incredibles and Lee Unkrich was the Jack in a Box in Toy Story 3).
"It was news to me. I did not know about that, so I was a little surprised. I ended up voicing this character. It was just one line, but now I have a Cars character. I'm very excited about that."
Kind of makes you want to see Cars 2 even more, doesn't it?
My mistake, John was in 2 previous Pixar films: A Bug’s Life (Harry the Mosquito) and Toy Story 2 (Blue Rock ‘Em Sock ‘Em Robot).