地道口语：walk a thin line
- Well, as you know, Sebastian and I were in college together... And he w- He was- He was always saying how great south Florida is... and that maybe my wife and I might enjoy it here, so we decided to come down here.
- Are you a comedian too?
- Excuse me?
- Like your friend over here.
- He's walking a very thin line. It's a good thing he knows how to write.