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The adventure I would most like to have run or played in has got to be To Go, an Unknown Armies campaign book in which the main characters are caught up in the creation of a mystical creature from the unconscious mind of the American population. Surprisingly or not, the creation of this entity begins in a meat-packing plant with a sacrificial beast. From there, frozen beef patties are delivered all over the country by a single trucker. The players embroil themselves in catching up with those deliveries, trying to shape the way the creature forms, while other interested factions do the same.
It’s been a while since I read the book — and I since sold off, so I have the double whammy of having spoiled myself and am unable to run it — but I recall a Tim Powers-style poker game where characters can wager intangibles like their memories and abilities, but an encounter with a modern avatar of Dionysus and the bacchae (all referred to as “Becky”).
Man, now I really want to rustle up a copy of To Go and Unknown Armies to break up the Pathfinder marathon going on these days in my circles. To Go was the companion work to Break Today, which detailed Mak Attax, a mystical conspiracy embedded in a fast food restaurant chain. I hadn’t paid them much mind until I read the book, and then the reach of their organization and their potential for positive change amazed me. Often Mak Attax gets written off as uninformed losers, but then they pulled off the safe and happy new year in 1999, and no one blinked.