Friends features many famous moments that constitute recurring gags or a singular joke that define the show. Over the years, the adventures of Rachel (Jennifer Aniston), Monica (Courtney Cox), Phoebe (Lisa Kudrow), Joey (Matt LeBlanc), Chandler (Matthew Perry), and Ross (David Schwimmer) began to comprise some familiar beats and themes. As the intro song says, Friends is about these characters wading through professional struggles, relationships, and more, all the while having each other’s backs themes that are expressed within a few seconds in each of the show’s defining moments.