I'll admit to having done this....you ?

Never done it.

I'm curious, what does it achieve, other than getting Coke on a peanut?
Peanuts are hard, fibrous food. Pieces of the nut often enter the digestive tract intact. Since human digestive enzymes cannot penetrate these large pieces quickly enough, they pass through undigested. What does that achieve? Well you can pebble-dash the lavatory pan, though I wouldn't recommend it.
 

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