A while back in high school my classes watched "My Boss My Hero," in which the main character says ほんや, it was translated as "What?" (I think.) In any case, I've never heard anything stylistically similar, so I was wondering where it came from.
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The main character of My Boss My Hero, Sasaki Makio, says はにゃ？ as an expression when unsure or
As said in Wikipedia
When in doubt while thinking, he says his favorite phrase, 'hanya?'
This is not a common Japanese word or saying and is unique to the character to help give him flavor.