give someone a taste of his or her own medicine

Example: “He always interrupts people, so we gave him a taste of his own medicine.”

Origin: The underlying story is one of Aesop's fables, in which a cobbler with no medical training sets himself up as a physician and sells a supposed antidote to poisons. The local ruler, suspicious, summons him and offers him a cup — telling him it contains his own remedy mixed with poison — at which the fraud immediately confesses, having no confidence whatever in what he had been selling to others. The test is exact: the quack is not punished so much as simply required to accept what he had been administering. The English phrase is nineteenth-century, and it keeps that structure, which is why it carries a note of justice rather than mere revenge — the treatment is not invented for the occasion but is the person's own, returned to them.