I have always thought that the platypus was God’s way of showing his sense of humor.
I thought that was what explained nipples on men.
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That is what I always thought, too. So do many others, which is why this thread is so funny. But I got intrigued by the other animal mentioned above, the echidna, which I do not recall hearing of before this: not only an egg-laying mammal, but in addition has no nipples, body temperature only 30C or so, living when the dinosaurs roamed, and able to quite easily outsmart the biologists studying them. I would love to see an echidna train, though I know I never will. Now, I am not sure which of God's creatures I nominate as His most humorous... there have to be dozens in the running, but echidna has to be near the top.
The best description I saw online is from World Wildlife Federation
Wikipedia's, which I find good for pure scientific articles, has a good article about echidnas with some weird complimentary facts included. I'm surprised they didn't include the echidna's very low body temperature, though.