 Grice proposes that metaphor exemplifies this second way of playing out  the flouting scenario. Suppose I say to you, “you’re the cream in my coffee.” No human being literally is or literally could be a dollop of viscous potable dairy product I could literally stir into a piping hot breakfast beverage. This is a commonplace acceptance of which on your part isn’t about to be shaken by any words from me. So for you to take me as out to get that across, alone or in combination with other things, would be for you to take me to be “blatantly and inexplicably” violating Quantity (and/or Relation); you’d be portraying me as being utterly, obviously, and to all appearances pointlessly untruthful, uninformative, and irrelevant. But in circumstances such as these, the proposition that you’re the cream in my coffee reliably calls to mind a certain particular other proposition, “attributing to [you] some feature or features in respect of which [you] resemble (more or less fancifully) the mentioned substance.” Perhaps it’s the proposition that you’re such a comforting luxury (for me) that you’ve become a necessity (for me) for most intents and purposes—a proposition whose explicit expression is regrettably clumsy and longwinded and ungenerous. (In fact the 1924 DeSylva, Brown, and Henderson lyric Grice is quoting from continues as follows: “You’re the cream in my coffee, / You’re the salt in my stew, / You will always be / My necessity, / I’d be lost without you…”) The only obvious reason I could have for calling your attention to this proposition in these circumstances is in order to get it across and hence, vouch for its truth. So I do vouch for its truth.