In the movie "Gaslight" the bad guy is brought down by a woman

in a most delicious way. Ingrid Bergman holds her husband, Charles Boyer, at gunpoint and totally messes with him, gaslighting him the same way he did to her. A little sample: "It isn't here, you must have dreamed you put it there. Are you suggesting that this is a knife I hold in my hand? Have you gone mad, my husband?"