Are you also obsessed with Meghan Trainor's catchy hit, "All About That Bass"? Well Jimmy Fallon just gave it the classroom instruments treatment, so if you didn't know about the track before — which is unlikely, as it's sitting at No. 2 on Billboard's Hot 100 — you're about to love it. Honestly, the video is worth watching just to see Fallon singing about bringing booty back. Take a look!