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When two runners pass each other there's not much time for a lengthy communiqué, words have to be chosen carefully, you might just about get 140 characters in there. (I guess runners have been tweeting even before Twitter was invented.) Passing runner's greetings I've heard can be unadventurous - "Morning." Or witty - "It's easier in this direction." Or informative - "Watch out for the white dog, his owner can't control him." Or friendly - "How far have you run?" Or an exhausted - "Can't speak." But the most useful one I have heard was - "There's a guy with a rifle on the other side of the canal, speed up".