I'm aware of evildoers trying to record you saying "yes" on the phone, but I think I got a variant this afternoon. After the usual "This is xxx calling on a recorded line" stuff, they said they wanted some poilitical opinions.
I wasn't busy, so I held on. The questions were to be answered "approve, dissaprove, or no opinion". Sounded a little strange instead of a simple yes/no, but I answered "approve" to the first question. Then they asked me to repeat that - and I hung up.
Perhaps I'm now schediled to answer "approve" on some slimey sales pitch.