as mad as a March hare
  (ad.)瘋狂地
  March n.  The third month of the year, containing thirty-one days.
  The stormy March is come at last,
  With wind, and cloud, and changing skies.   --Bryant.
  As mad as a March Hare, an old English Saying derived from the fact that March is the rutting time of hares, when they are excitable and violent.