Nightmare

The city of Tokyo is overrun by its machines, as they all come alive for a night of revelry, with only a single, drunken human (Chicken Man) awake to witness it.

This segment was inspired by the "Night on Bald Mountain" segment of Fantasia and is also said to be influenced by the Legend of Sleepy Hollow segment from c The Adventures of Ichabod and Mr. Toad.
This features the recent Japanese myth that machines can grow by connecting onto other machines, regardless of the purposes for which they were designed (as seen in Roujin Z).

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S01E09 - Ending