How did such a strange thing come about?
Why did that turn in to this kind of thing?
How did it come about?
How did such a thing come about?
Please tell me why this kind of thing happened.
Why did something like that happen?
なぜそんなことをしたの?
What did you do that for?
なぜそんなことをしたの?
How did such a thing come about?
In what way did this accident occur?
Why did this kind of thing happen?
Why did that end up turning out this way?
How did the accident come about?
Why did that change?
Why is it that you knew such a thing?
How could you tell that!?
Why did you know that kind of thing?