Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Mad

Mad as a hatter.
—Anonymous

Mad as an adder.
—Anonymous

Mad as a rat in a trap.
—Anonymous

Mad as a wet cat.
—Anonymous

Mad as blazes.
—Anonymous

Mad as tigers.
—Anonymous

Mad as all wrath.
—J. R. Bartlett’s Dictionary of Americanisms

Mad as a bull among bumble bees.
—J. R. Bartlett’s Dictionary of Americanisms

Mad as May butter.
—Beaumont and Fletcher

As Staring madde like March Hares.
—Andrew Borde (1490–1549.)

As mad as Orlando for his Angelica, or Hercules for his Hylas.
—Robert Burton

He is as mad as a March hare.
—Miguel de Cervantes

Mad … like the warrior in the fight.
—Barry Cornwall

Mad as a drunken squaw.
—Alfred Henry Lewis

Mad as the delirious dream
Of one who, on an Indian stream
Floating in a Morphean bark,
Feeds on the charmèd lotus leaf.
—T. Buchanan Read

Mad as Ajax.
—William Shakespeare

More mad
Than Telamon for his shield.
—William Shakespeare

Mad as the vexed sea.
—William Shakespeare