...when you arrive at Finnentrop station the first time irl and instinctively head for bridge at the Northern end of the platform to cross over the tracks. Another one: You ride on a DoSto train and want to change from one car to the next, press the button on the first door... then on the second, only it doesn't do anything... and then you catch yourself thinking, come on, this is not a class 166! (Both of these actually happened)
IRL when you climb into the cab to take over the service but end up sitting on the driver's lap because he hasn't disappeared! The court case is next week.
When you drive into a Tunnel and think 'oh good, there comes the end', only for it to suddenly jump further forward and take another 2 1/2 minutes to actually show itself!!!
When buildings pop up a few feet in front of you and you're absolutely sure that things are supposed to be like that...
Can't be any stranger than the Tunnel that I think we all know that I am talking about though can it!!
When you think "Why the heck does this building 200 metres in front of me cast a shadow? The farthest shadow should be no more than 100 metres away!"