The Labor senator was filmed, against his will, being bullied and racially vilified by a coven of burly, high-vis vest-wearing halfwits at a university bar in Melbourne.
They called Dastyari, an Iranian-born non-practising Muslim, a "terrorist" and a "monkey".
When Dastyari called them racist, they asked him: "What race is Islam?"
The scene was instantly familiar to anyone who has ever been bullied - the thugs' slow circling of their prey, the escalating taunts, the malicious dance on the edge of violence. They enjoyed every minute.
And on Dastyari's face, the uneasy calculations of the victim: Can I laugh this off? Can I ignore them? Will anyone step in to help?
The bar staff didn't, but Dastyari's fellow Labor MP Tim Watts was nearby, ducking in and out of the shakily-filmed video.
Watts stuck close to his friend and delivered what might just be the line of the year when he asked one of the men: "What race is dickhead?"