 Malapropisms may seem like a marginal phenomenon to be treated as a special case. But Davidson thinks the point generalizes, and that achieving passing-theory agreement involves far more work than participating in a convention. For a start there are plenty of relevantly similar phenomena (metaphor, polysemy, incomplete sentences, unfamiliar names, and performance errors such as slips of the tongue or temporary confusion over whether to use “underestimated” or “overestimated” after “cannot be”). Indeed, even where there is prior-theory agreement, general intelligence and not simply application of a known convention must be exercised by both speaker and audience to appreciate this fact.