The 'rat thing' is a squirrel.
If Kirby came from Egypt, you would stand in line and pay good money to see him just like King Tutankhamen.
It does not take all kinds, it is just that there are all kinds roaming the planet and we have become accustomed to that.
Humor, like beauty, is in the eye of the beholder and Kirby tickles me. Actually, the idea of Kirby tickles me. Just consider that I only mention Kirby about 2% of the number of times I think of Kirby in any given situation; Kirby goes to the circus, Kirby waits in the mailbox for the mailman, Kirby gives out candy at Halloween, etc., etc. ad nauseum. And I heavily restrict Kirby posting here- what you are seeing are just a few thoughts of his that sneak past my better judgment or those few times Kirby acts without my knowledge.
You were looking at a picture taken of Kirby's bad side. Then again, I guess Kirby doesn't really have a good side.
Brian
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Personally, I do find that rat thing pretty disgusting and not quite funny... but it takes all kinds.