I have watched both Friends and TBBT and have noticed the similarities
Both Shows have two apartments a main one and a Secondary one
Friends - Main Monica & Rachel (Later Monica & Chandler
TBBT - Main Sheldon & Leonard (Later Leonard and Penny)
Friends - Secondary Chandler & Joey (Later Joey & Rachel)
TBBT - Secondary Penny (Later Sheldon & Amy)
Both Shows have a Female Character Girl Next door
Friends = Rachel
TBBT = Penny
Both Female Characters Work as waitress’s
Friends - Rachel Worked at Central Perk
TBBT - Penny Worked at The Cheesecake Factory
Both Relationships ended in Season 3
Friends - Ross & Rachel S3 E16 TOW the
Morning After
TBBT - Leonard and Penny S3 E19 The Wheaton Recurrence
Both Nerd Male Characters had a Crush & end up with the most Attractive Girl of the show (but both Monica & Phoebe’ Amy & Bernadette were pretty good looking also)
Friends - Ross & Rachel
TBBT - Leonard & Penny
Both Shows have a Local Hangout
Friends - Central Perk
TBBT - Comic Book Store (but Amy Penny & Bernadette didn’t like hangout there that much)
Both had a Character considered the 7th Friend who couldn’t break the circle
Friends - Gunther
TBBT - Stewart
Both shows had Similarities in their characters
The Brainy Nerd
Friends - Ross
TBBT - Leonard
The Womaniser
Friends - Joey
TBBT - Howard (but came across more creepy)
The Hot Mess
Friends - Rachel
TBBT - Penny
The OTT OCD Character
Friends- Monica
TBBT - Sheldon
The Socially Awkward Character
Friends - Chandler (but Ross could also pass for this one too)
TBBT - Raj (he couldn’t speak to women for 6 seasons)
Drunk Vegas Wedding
Friends - Ross & Rachel
TBBT - Zac & Penny
Bromance
Friends - Joey & Chandler
TBBT - Raj & Howard
Both have Obese Unseen Characters
Friends - Ugly Naked Guy
TBBT - Howard's Mom
Both had Eccentric Characters
Friends - Phoebe
TBBT - Sheldon
One of the Female Characters had to show their Socially Awkward boyfriend how to be in a relationship
Friends - Monica
TBBT - Amy
Just some of the similarities between the two shows I give the benefit of the doubt to Friends since it was first but funny how it inspired other sitcoms (TBBT HIMYM etc)