YOU SAID:
How on earth did that happen
INTO JAPANESE
一体どうしてそんなことになったの
BACK INTO ENGLISH
How did that happen
INTO JAPANESE
どうしてこうなりました
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how did this happen
INTO JAPANESE
どうしてそうなった
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how did that happen
INTO JAPANESE
どうしてこうなりました
BACK INTO ENGLISH
how did this happen
INTO JAPANESE
どうしてそうなった
BACK INTO ENGLISH
how did that happen
it is unlikely that this phrase will ever reach equilibrium