3x17 "The One Without the Ski Trip"

Ross and Rachel can no longer be in the same room as each other without arguing over who is to blame for their relationship ending, forcing the rest of the group to divide their time between them. When a lonely Ross is excluded from Rachel's ski trip with her pals, he visits Carol desperate for sympathy and tells her an embellished version of the break-up. Meanwhile Chandler, reminded of his parents breaking-up, starts smoking again.