Subtlety is key. First you introduce your curiosity on the subject, innocence is a must. "I thought this was rather interesting. Thoughts?" Next, start off slow--allow others to establish the conversation and its pace. Once established, you can then begin your subversion. Pose a question to gauge if people will take the bait. If the bait is taken, let it out. Pace yourself, going to crazy alerts people to the game. Finally, when the accusations begin, refute, refute, refute! If you must, make yourself appear to the victim of persecution.
Discuss.