It all started with Usher and Janelle Monae and quickly escalated into something else entirely.

Director Ava Duvernay stopped by The Late Show with Stephen Colbert last night and recounted her experience at President Barack Obama's formerly top secret birthday party and the dance-off that took place there and to say she's name-dropping would be a massive understatement.

If we're being honest, we were hoping for Beyoncé to arrive onto the scene in this tale but by the sounds of it, what actually happened was far more entertaining (and easier for mere mortals to behold).