I would like to know how to respond clearly and correctly to the question
"Isn't it something I haven't watched?"
with an answer to the effect that the person hasn't watched it.
I would like to know how to respond clearly and correctly to the question
"Isn't it something I haven't watched?"
with an answer to the effect that the person hasn't watched it.
If you aren't sure whether the technically correct one-word answer should be yes or no, given the double negation embedded in the question, it seems quite possible that the person who asked the question may not know what to make of a one-word answer either. It isn't difficult to imagine even more-byzantine formulations that likewise formally invite a yes/no answer. For example:
"Isn't it not impossible that it mightn't be something I haven't watched?"
Whether you answer yes or no, an objective third party may well harbor doubts about what simple proposition you intend to affirm or deny. The clarifying part of the response is what comes after the yes or no. For this reason, if your interest is in clear real-world communication, rather than in the formally correct (but not especially useful) solution to a logic puzzle, I recommend omitting the one-word verdict and jumping instead to the meaningful part of the response:
"You haven't watched it."
People won't find it strange if you answer "No I have not watched it" or "Yes I have not watched it", either way, unless they were being pedantic about it.
– Mobius Pizza Oct 23 '15 at 08:57