This is probably one of my favorite bits that they do on "Late Night With Jimmy Fallon". Occasionally, when they have a willing musical guest, before the show starts, Jimmy, The Roots, and whoever that musical guest is will do a rendition of one of their songs using classrooms instruments (think xylophone, kazoo, etc.). They're always amazing, and this rendition of "Blurred Lines" might be my new favorite. 

After watching that, there's really only one question left to be answered, and this YouTube commentor summed it up perfectly:

YouTube

Why yes, I do believe that is exactly what he's doing. (I don't recall ever having a banana maraca in my classroom growing up, do you?