Aside from their long time starring on the show, I bet the Friends actors will never forget such basics of the plot and characters of the show.
All in all, this was a fabulous job by Cox and Kudrow.
The series is still in syndication, and it airs all over the world, so actors like Cox and Kudrow probably still get a fair number of questions regarding the nature of Friends and plenty of minutiae about the show.
Besides, she was able to right herself when prompted by Cox.
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Bonus Round: FRIENDS with Courteney Cox & Lisa Kudrow | Celebrity Name Game