I almost agree with you Clive -- but I might generalize a bit more. There ought to be SOME reason why you would censor the final word -- but we might do that for other reasons. Suppose you're saying something unflattering about someone who comes into the room -- and you change the subject at the last minute.
Still, as Carol points out, it's easier to anticipate a dirty word -- and if the unflattering remarks dealt with the person's sexual organs -- well that would be all to the good, of course.
But if there's no motivation behind the switch, why bother?
Actually, on reflection, I can see one reason: the limeroid might function as a sort of shaggy dog story -- where the whole point is to raise expectations and then disappoint them -- make the reader wonder what your third rhyme could possibly be and then just don't rhyme at all.
There was a young lady, Miss Goringe
Who liked to dress up as an orange...
(Ogden Nash should get credit for the name "Miss Goringe" -- he claims to have stared at the poor woman very rudely just because he realized he could use her to rhyme 'orange'.)
Well, in theory that's possible, but I didn't finish the above because it looked like it'd probably be pretty lame.
I will say I got a chuckle from the Millard Filmore one -- even though the disappointment seems motiveless.
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