The bus on the bus go bus bus bus!

Depending on the route, I'd argue that you should be careful what you wish for. Having said that, I found your response extremely wholesome to a Kenneth Parcell level.

"Oh, hi, new friend! Is that a test tube in your mouth? You must be a scientist!"

"Golly, that sure is a big knife! Thanks for defending all of us bus friends!"

Commute friends are great. You've got a pleasant conversation for the ride, and another source of information when your ride is canceled.