[phone rings]

"Hi there," she says, her voice bright and enthusiastic. "This is Amy. Are you busy?"

I hear this voice once or twice a week, typically at 10 a.m. or thereabouts. The caller ID tells me the number comes from Texas. I imagine a stack of servers in a dark closet in a building on the outskirts of Dallas. I decide to have some fun.

"Amy, are you a robot?"

There's a pause, and for an instant I doubt my instincts.

Amy laughs. "No, I'm not a robot," she says, her voice bright and enthusiastic.

Shaken, I hang up.