The three lawyers buy a ticket each while the engineers by only one. The lawyers laugh at the engineers crying how can three people travel by train using only one ticket. The engineers respond with “you’ll see”.
They all board the train and the lawyers take a seat while the engineers cram into the bathroom. The train departs and soon after the conductor comes around collecting everyone’s tickets.
He gets to the bathroom and knocks on the door. “Tickets please”. The door opens just a bit and a hand shoots out with the ticket. The conductor take it and moves onto the next person.The lawyers think this is ingenious and decide to try it for themselves in the way back from the conference.
However on the return home while the lawyers were buying their single ticket, the notices the engineers weren’t buying any. They asked “how are three of you going to travel with out a ticket”. The engineers respond with “you’ll see”.
The lawyers cram into the bathroom and the engineers cram into one nearby. Shortly after the train leaves the station one of the engineers come out of their bathroom and go over to the lawyers one. They knock on the door.
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You know how in the first movie Hagrid gives Harry a ticket for the Hogwarts express and explicitly states that it's important, and he mustn't lose it? For a long time, I wondered why. There's not gonna be a controller who checks the tickets on the train, and if there was, what's he gonna do? Turn the train around?
So here's my theory: the ticket actually holds the Fidelius charm, just like the piece of parchment Harry received from Mad Eye in book 5, revealing Grimauld Place 5. It explains why muggles don't notice hundreds of children running through a wall in an immensely crowded place, and why they never receive a ticket again after their first year, since they only need to find out about the place once.
What are your thoughts? Did you find any contradictions to this theory? Do you have a different one?