 And the goals built into joke-telling and metaphor-making don’t meet this condition. No collaborative adjustment in what is taken for granted for present conversational purposes suffices by itself to make it the case that we relish the ridiculousness of a situation together, explore the ramifications of a comparison together, or what have you. So metaphors and jokes are instances of non-communicative verbal coordination: however much communication bringing off a metaphor or joke may often require, bringing off a metaphor or a joke is not in itself a communicative accomplishment. (The point has an interesting consequence for theories of  speech acts.  Sometimes speakers collaborate with audiences on the production of a perlocutionary effect without collaborating with them on the production of any enabling illocutionary effect. Such brute perlocutionary acts include the bringing off of metaphors and jokes. When we tell a joke or propound a metaphor, we do something by speaking as we do without doing anything in speaking as we do.)