Ep 11. The One Where Chandler Can't Remember Which Sister

In season 3 episode 11 of Friends, titled "The One Where Chandler Can't Remember Which Sister," the gang is celebrating the holidays together. Chandler brings up his difficulty in identifying which of Joey's sisters he had hooked up with at Joey's sister's wedding. He struggles to remember whether it was Mary Angela or Mary Theresa.

Meanwhile, Monica is desperately trying to impress her boyfriend's parents by cooking a sumptuous turkey for the first time. Rachel is struggling to adjust to her new job at Bloomingdale's and is finding it hard to connect with her co-workers. Phoebe's holiday plans are foiled when she realizes she's allergic to most festive foods.

As the episode progresses, Chandler embarks on a mission to figure out which of Joey's sisters he slept with. He calls Joey's mother, who is less than impressed with this line of questioning. He also tries calling Mary Angela and Mary Theresa, but they don't remember him. The rest of the gang tries to help him, but to no avail.

Monica's turkey seems to be going well, until she accidentally puts the dessert fork in the turkey instead of a meat fork. This leads to a comical scene where the gang tries to pry the fork out of the turkey while it's still stuck in the oven.

Rachel, feeling left out of her co-workers' conversations, tries to impress them with her knowledge of fashion and celebrities. However, her attempts at making conversation only lead to awkward silences.

Phoebe, frustrated by her allergies, tries to create her own holiday traditions. She ends up leading the gang in a rendition of "The Little Drummer Boy" with her guitar, which turns out to be a hit.

The episode ends with Chandler finally figuring out which of Joey's sisters he slept with - Mary Angela. However, he realizes that the whole ordeal was not worth it and regrets obsessing over it. The gang gathers together for a heartwarming rendition of "O Come All Ye Faithful" as the episode comes to a close.

Overall, "The One Where Chandler Can't Remember Which Sister" is a classic Friends holiday episode packed with hilarious moments and heartwarming scenes. It showcases the strong bond between the group and their ability to come together during trying times.