Two-year-old as finite state machine
Some time ago I joined a family for dinner, and they had a two-year-old. During dinner, the two-year-old accidentally knocked over her glass, and liquid quickly spread across the table. The adults at the table sprang into action, containing the spill on the table, wiping it up, and checking for leakage onto the floor.
After all the excitement died down, the two-year-old looked down, saw the empty glass, and threw her hands up in the air, proudly announcing, “I drank it all!”