Conversation Stoppers are those common accusations, declarations, rhetorical questions, or sincere questions about various aspects of Christianity that can trip up or completely tongue tie the Christian, hence they "stop" the conversation.
Sometimes, our friends will have "questions behind questions" - they will ask one thing but be looking for something else. By asking "why do you ask," we invite our friends to share what's most important to them.
It's normal to feel overwhelmed or deflated when facing a tough question, but there is a way to face these questions with grace and humility, especially when we can't give a complete answer.