References in classic literature ?
Quasimodo was surrounded, seized, garroted; he roared, he foamed at the mouth, he bit; and had it been broad daylight, there is no doubt that his face alone, rendered more hideous by wrath, would have put the entire squad to flight.
It came from the fang -- like teeth of the dwarf, who ground them and gnashed them as he foamed at the mouth, and glared, with an expression of maniacal rage, into the upturned countenances of the king and his seven companions.
Pott flung himself into a chair, and foamed at the mouth.