Stardate 3183.3: The Enterprise is attacked by three Romulan vessels and hides in a gaseous energy field. Upon leaving the cloud, someone begins to play practical jokes on the crew, and outrageous laughter comes from the intercom. It turns out that the ship's computer was affected by the cloud and is now suffering a "nervous breakdown". When the Romulans return, the Enterprise even creates an inflatable duplicate of itself to fool them. Kirk tricks the Enterprise back into the cloud, and all systems return to normal, while the Romulans now have the practical joker on their ships.

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