During an appearance on The Ellen DeGeneres ShowTuesday, Courteney Cox's knowledge of Friends was put to the test.

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DeGeneres and an assistant had Cox play the trivia game Heads Up, with the questions all relating to characters or plot points from Friends, and it turns out Cox is just as competitive as Monica! Good thing her apartment wasn't on the line this time.

How well did Cox do, and what stumped her? Check out the video below to see for yourself.