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'Friends' had several iconic moments during its 10 seasons on the air. What made things that much more special is the fact that some of those great moments were completely unscripted.

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We'll take a look back and reveal which scenes were completely organic - including one that made the audience laugh extra hard thanks to Jennifer Aniston.

It Wasn't The First Time 'Friends' Used An Unscripted Line On The Show

Even during the reunion, Jennifer Aniston did not realize how hard it was going to be. Once she arrived on-set, memories came rushing back, even tough ones.

"It just took me by surprise because it was like, 'Hi, past, remember me? Remember how that sucked? You thought everything was in front of you and life was going to be just gorgeous and then you went through maybe the hardest time in your life?'"

On camera however, the cast got along great and it was reflected, as they all had great chemistry. In addition, a lot of what you saw on the show was at times completely organic.

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Like let's say the scene that featured Chandler locked in Rachel's boss' office. When Chandler opens the cabinet on his head, that moment was completely unscripted. It was a miracle that Aniston was able to keep things together, as the audience at home and in studio had a major laugh over the brilliant moment.

It wasn't the first time Matthew Perry went off-script. He did the same when mocking Joey, telling him, "you have to stop the Q-tip when there's resistance."

Chandler also unscripted the final line of the show, "where," when Ross asks everyone to go for a cup of coffee during the show's last scene.

That wasn't all, Aniston added in a certain line herself, one the fans completely ate up.

Jennifer Aniston's "World's Worst Hangover" Line Caused The Audience To Lose It

The episode 'The One After Vegas' aired back in 1999, it was the first episode of season 6. Of course, 'Friends' fans are aware of what went down as in the final episode of season 5, Rachel and Ross get hitched, just before Monica and Chandler were about to do the same.

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Once they get back, Ross is hesitant to get another divorce. However, Rachel wants to end things ASAP, it is at this point when Aniston drops the iconic line, "This isn't a marriage, this is just the world's worst hangover!"

Now according to Ms Mojo, not only was the moment completely unscripted, but it also got a huge laugh from the live studio audience. Given the reaction, the show had to actually edit out the amount of laughter that took place during the scene.

It was a brilliant moment, especially for Aniston to think on her feet like that. However, she wasn't always a fan of unscripted moments...

Jennifer Aniston Hated The Unscripted Fake Dummy Moment On 'Friends'

In February of 2001, 'The One with the Truth About London' took place in season 7, episode 16. This time around, Jennifer Aniston was not pleased with the unscripted moment, one that was completely planned by David Schwimmer, who helped produce the episode.

The plot sees Rachel turn into a cool aunt, by showing Ben different pranks. Ross isn't a fan, stating that he hates such jokes.

Well, ultimately, the biggest joke of them all was on Rachel, as in the final scene of the show, a dummy is used, dressed as Ross. The dummy soars down a flight of stairs and the only problem here is that Jen was never notified about the moment taking place.

The result, Aniston was visibly upset while Schwimmer had a blast with the moment. It was one of the many times those in the show decided to go off script and in truth, a lot of the times it worked out just perfectly.

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