I was sitting at my desk at the church office, doing the bookkeeping, and talking with a friend sitting on the other side. Let's call her "Mildred".

Somehow the topic of gossip came up, and Mildred said, "yeah, it can be a real problem for some people. [slight pause] Do
you have a problem with gossip?"
In a flash of inspiration, I lowered my voice, leaned forward, and said "No, but do you know who does?" She took that bait. She leaned forward, eyes wide open, and said, "No,
who?"