Although I may be wrong...
Flo and Andy are at a wedding, and Flo says "Where are the happy couple?". I immediately thought, hang on, 'couple' is a singular term, and therefore maybe it should be "Where is the happy couple?".
Now I'm thinking the individual components of "the happy couple" could be in two different parts of the room, and so "where are" might be okay...
I need a beer.