>
>I remember reading a Sutta (or was it a Commentary) about how a person (a
>brahmin youth?) who wanted to challenge the Buddha with a two-edged
>question, answering either way incriminates the answerer. The Buddha reads
>the youth's mind and tells him exactly what kind of question it was. The
>youth was impressed.
>
>Does anyone know which Sutta or Commentary this story comes from?

This sounds at least partly like the Abhayaraajakumaara Sutta, M-58.
The youth is a khattiya rather than a brahmin, and he is incited by
Niga.n.tha Naataputta to ask a question where either a yes or a no
answer would leave the Buddha open to a snappy reply. When asked, the
Buddha states "There is no one-sided answer to that, prince," which
leaves the prince impressed. The Buddha then explains the answer in
more detail. (from Ñaa.namoli's translation).

Hope this is the right reference.

best regards,

--ET