All the kitten upgrades had the quotes go some variety of "meow meow meow," but this last one, Kitten engineers, went "meow meow meow meow, sir" and that 'sir' made it impossible to forget for all these years.
I also liked the news ticker it had, which would reflect the newest developments in your cookie industry. I think the Kitten engineers one came a blurb about how kittens in adorable hardhats were spotted around the facility.