It is the 21st episode of Season 8. Monica got a bad food review, so she went to the person who wrote the review to argue with her.

When Phoebe was interviewing Chandler, she asked him what his last name was. Chandler said his last name was Bing, and Phoebe said that this last name was very special. Qian said, yes, you should meet my uncle "bada" (so this person should be called "bada bing", hehe)

At this time, Chandler should not have entered the advertising industry yet, It was in season 9 that he gave up his original job and entered the advertising industry.