Well, Roger, what I meant by a motive was a reason for the speaker (not exactly the poet) to suddenly change course.
Most of the limeroids seem based on the experience we all have of needing to change the subject at the last minute.
In your Fillmore thing, the rhymes create a sort of dramatic irony -- Grant is speaking unironically, but the rhymes whisper that his perspective is out of whack. Well, something like that.
Do you think there's an article in this, "Limeroids: Theory and Practice"?
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