The Wheels on the Bus.... do what?

I've been taking a "Mommy & Me" swimming class with Abby at the YMCA. It's fun; we practice different moves in the water, play with toys, and sing songs. One of the songs we sing every week is "The Wheels on the Bus." I'm pretty new at this whole Mommy thing, so I don't know the words to all these kids songs. I'm good with the first verse or two, then I wind up kind of lamely mouthing some words and watching all the super-mommies to try to catch up.

My ignorance was captured on video for all to enjoy.