It worked for me once. Gave them just enough info to make wrong assumptiions. Judged it to perfection and got really lucky.

Not like this. You don't just sit there in silence, that's be weird. You talk vaguely around the subject without disclosing specifics.

And clients will appreciate that you respect confidentiality.

I tried it once. The interview ended about 2 minutes later and I did not get the job. The rejection email said it was because I wasn't forthcoming.