Chandler and Monica Bing! Matthew Perry invited former Friends costar Courteney Cox to guest on his NBC series Go On in April 2013 nine years after the real-life friends said goodbye to Central Perk in
24 Ways Monica And Chandler Ruined All Other Relationships For You
In the first couple of episodes, Monica and Rachel’s apartment number was No. This was changed in later episodes to No. 20 because the producers noted that 5 corresponded to an apartment on lower floor.
The pair have been in each other's lives for decades, since they were wee little pups.