Julia Roberts appeared on Friends in exchange for Matthew Perry writing her quantum physics paper for her. The Pretty Woman star, 53, made a memorable guest appearance in the hit US sitcom in 1996 as Chandler Bing's love interest in the iconic two-parter dubbed The One After the Superbowl.
And it seems as though for Matthew, convincing the future Oscar winner to star in an episode of the award-winning show was harder than it sounds.
Julia cheekily suggested she'd make an appearance only under one condition - for Matthew to write her paper for her. The sitcom's co-creators Kevin Bright and Marta Kauffman have broken down the episode to The Hollywood Reporter in honour of the show's 25 years.
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