YOU SAID:

tell me something i dont know

INTO JAPANESE

私知らない何かを教えてください。

BACK INTO ENGLISH

Tell me something I don't know.

INTO JAPANESE

何の話か分からない

BACK INTO ENGLISH

- I don't know what you're talking about.

INTO JAPANESE

- 何の事だ？

BACK INTO ENGLISH

- I don't know what you're talking about.