Brad Pitt: Probably the most famous of the numerous cameos, this one was special because Pitt was married to cast member Jennifer Aniston at the time. In the episode titled ‘The One with the Rumor’ from season eight, Pitt played Will Colbert, who went to high school with Ross, Rachel and Monica. Back in the day, Will was on the heavier side and was apparently bullied by a younger Rachel. When Will shows up for Thanksgiving dinner, Rachel is enamoured by the now slimmer and very handsome Will. However, Will is still bitter about the bullying and gives Rachel the cold shoulder through the evening. Hilarity ensues when Rachel finds out that Ross and Will had founded an ‘I Hate Rachel Green’ club when they were in school.
NBC