Whatever you do, don't say yes when this chatbot asks, 'Can you hear me?'

It's the most cunning robocall scam I've encountered -- and the fact that I've fallen for it more than once tells you how successful it can be. You pick it up and say "hello." There's a brief silence and then a woman's voice says, "Oh, hi there!" She offers an embarrassed laugh. "I'm sorry, I was having a little trouble with my headset!"