I play tabletop RPGs -- have been since about 1980. You don't have to worry about blocking or hitting your mark (unless you're using miniatures), as the action all takes place in your head. They're great for improvising dialog, and if someone takes notes, the story can be re-narrated later.
It's been said that Firefly and Serenity were born out of Joss Whedon's own Traveller campaign, but he will neither confirm nor deny it.
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