αὐτοτραγικὸς πίθηκος
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
English (LSJ)
αὐτοτραγικὸς πίθηκος = a very ape of tragedy, tragic-ape, monkey of melodrama, drama-queen of an ape, Demosthenes, On the Crown 18.242.