Moore mentions having seen that excellent comic genius John Liston behind the scenes in a towering rage about some trifle, while he was dressed and "made up" for the part of Rigdum Funidos,--a contrast which must have been as ludicrous as when Washington Irving met Grimaldi in a furious rage behind the curtain, with the regular stage grin painted on his cheeks. Liston began his profession in tragic parts and developed his wonderful comic powers by chance, being suddenly called upon one evening to fill the low comedian's place on account of the illness of the actor cast for the part. He made a hit at once, such as he had not dreamed of, and it was seen by every one that he was naturally a comic actor. On the occasion referred to, by the exercise of his extraordinary facial powers he caused the spectators and actors, until the curtain fell on the closing scene, to roar with laughter, though but very little of the text had been audible to them. True genius loses itself in the character and the subject. Betterton, when he performed Hamlet, by reason of the violent and sudden emotion of amazement and horror at the presence of his father's spectre, absolutely turned as white as his neckcloth, although his natural cast of countenance was very florid, while his whole body seemed affected by an uncontrollable tremor. Had his father's apparition indeed risen before him, he could not have been seized with more real agonies. When a well-known actor of that period, named Booth, first took the part of the ghost, Betterton acted Hamlet; on which occasion his extraordinary look struck Booth with such horror that for a moment he remained silent, having forgotten his part.[187]