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"She meant," replied Poirot promptly, "that she found it on top of a wardrobe."
"A funny place for a piece of brown paper," I mused.
"Not at all. The top of a wardrobe is an excellent place for brown paper and cardboard boxes. I have kept them there myself. Neatly arranged, there is nothing to offend the eye."
It's possible that OCD is the funniest character trait Christie could have picked for its running joke value.