Every time there's a Tube strike, Londoners seem to find their Dunkirk spirit. We put hate to one side and dig deep. We repeatedly hear of amusing commutes, we see funny viral images and memes popping up all over the place. People talk to each other. Keep calm and carry on. This resilience and levity is something we need to remember to in the build-up to yet another strike. There are a lot of reasons, serious, legitimate and convincing ones, to both agree and disagree with striking Tube workers. Yet there's always an emotion underpinning the thoughts of non-Tube staff: Envy.