First off I thought, well, that's a strange punishment. How's the monkey meant to learn from that?
Apparently it saved the monkey's life. The 50-year-old man from China spotted the peanut shells on the ground and realised that the monkey could be about to die. So he started to lick its bottom.
I have to admit, I have been doing CPR wrong all my life.
He did it to make the monkey pass the peanuts more quickly. I am not going to dispute his theory, maybe it does work. But how do you discover that? The only way is that you were licking a monkey's bum one day and noticed it made the monkey do its toilet.
Either way, I have learned from this. The next time I'm on a plane, someone collapses with a potentially fatal peanut allergy, and the stewardess says, "Is there a doctor on board?" I'll have to say, "Forget the doctor. Does anyone know how to do a rusty trombone*?"
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* If you don't know what that is, don't Google it.