Chandler is afraid when he is not so good at his vows while he thinks Monica is. But meanwhile, Monica turns to Rachel and Phoebe for help because she's not so good at them either. Chandler turns to the guys and Monica turns to the girls. To help them know what to write, they start to go through flashback scenes of their history in the past three years.
A fair episode, but not exactly one of the best. It wasn't as much funny as the other ones in the seventh season.