Yesterday at Kotaku, Chris Person published the video above about LSD: Dream Emulator, a Sony PlayStation game released in 1998. It was based on a dream journal that Hiroko Nishikawa, a staffer at a Japanese video game company, had kept for a decade, and it attempted to mimick the logic (or illogic) of dreams. (You can watch the trippy intro on YouTube.)
The bad news? The game was only released in Japan, and is not that easy to find. The good news? There are copies out there, though some of them do not come cheap. Anyway, it looks amazing.