影视英语口语:不记得

“不记得”在英语口语里能怎么说？

蹩脚口语：be careful
地道口语：walk a thin line

影视来源：《马利和我》
剧情引导：
John去一家报社面试，老板问他为什么要到此地来，他说是因为大学老同学的竭力推荐，而这位老同学正在窗外指手划脚地扮鬼脸呢……

- 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.
- No.
- He's walking a very thin line. It's a good thing he knows how to write.
...