Walking around in circles

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Roving around the city, I have noticed something odd. Folks wander here and there aimlessly like zombies. Ask them something and they just stare at you blankly. With great difficulty, some manage to utter words which are hard to understand. At random times, they suddenly become active, start running towards a fast approaching bus or taxi in vain hope that it will sallow them up and vomit them at some new destination. At times they just spin around in circles while making odd noises while some gather in bunches and run around some object as they sing some song which I can't place. Have you noticed anything similar or have you participated in such activities?