Sorry, I couldn't help overhearing, did you mention something about...
对不起,我无意中听到你们的谈话,你们是不是提到...
Have you ever put your trousers in the washing machine and then remembered there was a large bank note in your back pocket?
你有没有把裤子塞洗衣机,然后又想在裤子的后兜有一张大面值的纸币?