Loads of empty seats on the train carriage that I’ve got on.
So because there’s loads of room and I’m early I sit down at a table facing forwards.This woman comes up and says ‘I like to sit facing forward and at a table, do you mind if I sit next to you?’
I said yeah sure no probs.
So we are squashed like sardines whilst there’s loads of empty seats (without tables) all around us.
I got up and said actually I’ll just go over here nil probs and she was like ohhh are you sure?
Yes I’m sure lol because I don’t want to sit next to you squashed up for the next 3 hours whilst there are loads of seats!
How bizarre 
Surely you’d just say to yourself ‘oh well the table seat is taken, I’ll sit somewhere else in the other 59 forward facing seats available’? Or AIBU?
I said yeah sure no probs- apparently this wasn't strictly true 