"It was huge, I had no idea it was going to become so iconic," Hamnett tells Refinery29 of the moment. "The power of the slogan T-shirt is that it's on your body, so it becomes a part of you. There's no filter." But despite the fact that the encounter became one of the most memorable political protests in modern history, Hamnett discourages us from thinking that it starts — and ends — with a worn slogan. "While these T-shirts are always relevant, whether it's anti-nuclear or anti-pollution, it's not going to save the world. You need to get out there. Jeremy Corbyn said, 'The only thing that changes a politician's behavior is something that threatens their ability to get re-elected.'"