In the first couple of episodes, Monica and Rachel's apartment number was No. 5. This was changed in later episodes to No. 20 because the producers noted that 5 corresponded to an apartment on lower floor. | 25 Fascinating Facts You Might Not Know About "Friends"
And while reading these I could think of each episode it's from and the tone/mannerism in which it was said hahahahah The 33 Best Chandler Bing One-Liners - Love Chandler= my fav :) I quote and laugh at his zingers
Smile - What it usually means: A pleased, kind, or amused facial expression characterized by an upturning of the corners of the mouth. What it means to Chandler fans: Something one can absolutely not do correctly when a camera is pointing at their face.