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One nun says "Where's the soap?", wondering where it is.
The second says "Yes, it does (WEAR the soap), doesn't it?". The joke is in what the second nun is DOING with the soap that would be wearing it down, with the presumption that the soap is under the water somewhere, what with the first nun not knowing where it was.
If it was funny before, it's certainly not once it's been dissected like this. Hehe.
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