“This might be a bit difficult to explain, but-”
“Are you from another dimension, where everything is the same as it is here, albeit with a few differences interspersed throughout?”
“No, but-“
“Are you stuck in a time loop, and have to find some way to convince someone – anyone, really – that all of this has happened before?”
“No, but-“
“Have you arrived from the future to steer humanity away from the whole concept of time travel, as it will inevitably lead to a stable time loop wherein Skynet exists?”
“…no?”
“What seems to be the problem, then?”
“Well, you see, I was in a hurry before boarding the train, and accidentally bought tickets in the wrong direction”
“Let’s see. Ah yes. Well, they cost the same either way, so you bought the right one in spirit. No need to worry”
“Thanks”