Behemoth from The Master and Margarita.
… But worse things were to be found in the bedroom: on the jeweller’s wife’s ottoman, in a casual pose, sprawled a third party — namely, a black cat of uncanny size, with a glass of vodka in one paw and a fork, on which he had managed to spear a pickled mushroom, in the other.
The light, faint in the bedroom anyway, now began to grow quite dark in Styopa’s eyes. ‘This is apparently how one loses one’s mind…’ he thought and caught hold of the doorpost.