6x15/16 "The One That Could Have Been"

The gang ponders what might have been if Ross and Carol had stayed married, Monica had still been fat, Chandler had become a struggling writer, Joey had still worked on Days of our Lives, Rachel had married Barry and Phoebe had become a stockbroker. Fat virgin Monica is dating Roger and considers having sex with him for the first time. Ross attempts to spice up his marriage with Carol and ends up suggesting a threesome. Rachel instantly falls for Joey after seeing him for the first time in Central Perk, while Chandler attempts to cope with being Joey's assistant, with mixed results. Phoebe ends up in the hospital because of a mishap at work and a heart attack. Rachel almost has an affair with Joey, and finds Barry cheating on her. Ross realizes Carol is a lesbian by partaking in a threesome with Susan only to find himself very much left out. Phoebe is very stressed because of her time away from work; she has a heart attack and is subsequently fired. Monica's attempts to sleep with Roger go awry, due to Roger's busy schedule, and when Chandler attempts to comfort her, they end up in bed together.