Learn what "i don't even know why that happened" means, when people say it, and how to use it naturally in English.

This means the speaker genuinely does not understand the cause of an event.
From Cleopatra, Episode 20
The speaker is admitting confusion about why something happened.
Use this when you want to admit confusion or uncertainty in conversation. It is common and natural, but vague if you need to give a specific explanation.
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