"Bus out of nowhere" - well said. Whenever those derailing questions/comments come out - pretty rare, but worth preparing for - that's great advice to just ...

"Bus out of nowhere" - well said. Whenever those derailing questions/comments come out - pretty rare, but worth preparing for - that's great advice to just ... stop. Take a drink. Respond respectfully, punt to post-session conversation if possible, thank them, and move on. The audience won't even know what happened if you smoothly slide back into your routine.