From that first show-changing hookup in the limo, "Chair" became one of TV's most iconic couples, right up there with Friends' Ross and Rachel, The O.C.'s Seth and Summer, etc. Sure, they had their ups (Chuck finally saying "I love you") and downs (Chuck sold her for a hotel), but these two were made for each other. They were inevitable. 

So what couple could possibly beat "Chair" for the throne?