The document describes an event that took place in Trafalgar Square, London during the evening. A man created bubbles that the children reacted to by trying to pop them. The adults observed without participating. When people saw the man, they used heuristics to assume aspects of his identity based on his clothing. The children began mimicking each other by popping bubbles due to mirror neurons. Meanwhile, the adults refrained from joining in order to avoid seeming immature. The children's positive experience created a mood-dependent memory, so they will more easily recall Trafalgar Square as a fun place in the future and may feel nostalgia if they return.