Mrs. Hudson: So – it’s the big day then!
Sherlock: What big day?
Mrs. Hudson: The wedding! John and Mary getting married!
Sherlock: Two people who currently live together are about to attend church, have a party, go on a short holiday, then carry on living together. What’s big about that?
Mrs. Hudson: It changes people – marriage. … Marriage changes you as a person in ways you can’t imagine.