γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → the fool laughs even when there's nothing to laugh at
P. ποικιλία, ἡ.
intricacies of discussion: V. περιπλοκαὶ λόγων, αἱ (Euripides, Phoenissae 494).