Duplicate
Put a spirit in a black hole and a duplicate comes out. The duplicate looks exactly like the original spirit that went in. How strange.
Examine the duplicate spirit. Same ghosty body. Same ghosty glow. A perfect copy.
ふく
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Suddenly the duplicate spirit starts yelling, "Why did you throw me into that black hole?! F*** (ふく) you!"
You feel pretty bad now. The duplicate spirit seems to have decided to haunt you, and it's muttering "F*** you, f*** you," over and over in your ear.