This is our favorite new version of 'Blurred Lines'!

Robin Thicke was the latest star to get the "classroom instruments" treatment on 'Late Night With Jimmy Fallon,' playfully jamming along with Fallon and the Roots to his mega-hit last night (Aug. 1).

Surprisingly, the super-slick 'Blurred Lines' sounds like it was made to be played on instruments one would find in an elementary school -- with Thicke and company rocking out on items including a tiny toy xylophone, ukelele, cowbell, kazoo and ... uh, is that a banana?!?

The performers' obvious joy makes the summer's catchiest song that much more infectious -- watch the video above to join in the fun!