The cow of Mrs. O'Leary. This cow, Daisy, is blamed for starting the Chicago Fire on October 8, 1871, which burnt down most of Chicago. Supposedly it all started when Mrs. O'Leary was milking her cow. Daisy got upset and kicked over a bucket that had a lantern on it. These days most people believe that Mrs. O'Leary and her cow were just conveinent scapegoats for the fire.