The scene is the agora, outside the office of the magistrate. Socrates is on his way to answer charges of impiety. There he meets Thermippos holding forth confidently amidst a gathering of young men. Naturally, since death is on his mind, Socrates seizes the opportunity to discuss the subject with a man who seems certain of everything.
Socrates. You agree, Thermippos, that all men are mortal.
Thermippos. I do.
Socrates. And you agree furthermore that I am a man.
Thermippos. I have no reason to doubt it, Socrates.
Socrates. Surely then you agree that I am mortal.
Thermippos. I didn’t say that. You did. Don’t put words in my mouth.
Socrates. I beg your pardon, Thermippos, but I have simply drawn what follows.
Socrates. But no true reasoner could fail —
Thermippos. Ah, the no-true-Macedonian fallacy.
Socrates. But, Thermippos, given the logical form . . .
Thermippos. Define “logical form”.
Socrates. . . . you must either accept the conclusion or reject at least one of the premises.
Thermippos. False dichotomy.
Socrates. I see, Thermippos. You’re an idiot.
Thermippos. And that’s an ad hominem.
Socrates ad-hominems Thermippos with a brick. The charges of impiety are dropped.