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Originally posted by Misterlondon
Actually it seems it was a flash mob..
Nothing, it turns out. Laughter for laughter’s sake is the goal of the Berlin Laughter Project, which orchestrated the event in a sort of flash-mob-meets-performance-art event. The absurdity of the laughter puts everyone on the train in stitches, elevating a dreary commute to an endorphin-boosting ride that leaves its passengers — and the video’s 1 million-plus viewers