Every now and then DH and I will turn to each other, adopt a serious mien, and say, "Hey... Chief..."
Ipswich is the episode which nearly caused DH to drive off the road laughing, but my personal favourite is St Petersburg, especially the conversation between Douglas and Martin in the cockpit after the goose strike because it says so much so subtly about how they've both changed, and also how protective everyone is of Arthur against his awful dad.