The prom video showed of one of the things Ross has done to show her love for Rachel. He excitedly wanted to go to the prom with Rachel upon knowing that Chip couldn't come. He was all excited about it. His parents were all supportive about it. However, when he was all set, (he even had the flowers for her - which he got in the vase)Chip was already downstairs. Breaking his heart into pieces. When Rachel and the gang saw this video. Rachel was really touched and he came up to Ross who was already standing in the door ready to leave. When he reached Ross, she just kissed him. And this is the official episode where Ross and Rachel have a relationship.
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