Decoder Ring has a brilliant story about Ong's Hat. It's a history of what is arguably the world's first alternate reality game, but at the same time, it's a story about conspiracy theories, history of electronic communication, transmedia art, storytelling, and human cognitive fallacies.
One of the more interesting stories I've ever heard on a podcast! Well worth one hour of your time.
The instance by the group behind Razmjena vještina & the Hacklab in Mama, Zagreb.