Can you hear me? (alleged telephone scam)

"Can you hear me? is a question asked in an alleged telephone scam that started occurring in the United States and Canada in 2017. It is alternatively known as the Say "yes" scam. Reports of this scam and warnings to the public have continued into 2020 in the US. There have also been several reports of the same kind of incidents happening in Europe. Questions have been raised as to whether such a scam actually occurred, or if it occurred in the form generally described.