"as different as night and... later that night", what does it mean?
Native speaker’s answer
Rebecca
"As different as night and...later that night" is a play-on words. This phrase is a play-on the original phrase "as different as night and day," which means complete opposites. However, Monica's phrase is suggesting that Ross and Russ are exactly the same or extremely similar. This is a made-up phrase to bring humor to the show.