I recently stayed at a house which had an alexa device. In a conversation where I said the words light switch several times Alexa beeped and responded to me each time. I think most of us just believe Amazon when they say "Alexa responds to its name" and don't stop to consider the possible failure modes. We want to believe it can understand our words, when it's really just guessing. Over long enough time it's inevitable that it will misunderstand you and do something you don't want.

Still, I wonder how it heard "record this conversation and send it to someone on my contact list".