Each Friday I pose a riddle for those who like that sort of thing. I freely admit that many of these stump me, but perhaps you’ll be able figure out this week’s riddle.
I am only useful when I am full yet I am always full of holes.
Leave your answer in the comment section and I’ll respond with the answer in the afternoon.
BosGuy 
If we consider a sponge’s utility to be purely a function of its absorbency, would not a sponge be only “useful” when empty? A soggy sponge isn’t useful, it’s used. I think jc’s answer makes more sense. 🙂
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All good tries – but the correct answer is a sponge. Good job JustBroccoli.
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A collander
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golf course!
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Collander
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A sponge??
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A bottom with low blood sugar?
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