Not a plane - a train.
I was on a particularly scenic train line a few weeks ago and I'd booked my seat so that I was at a window and a table. Train still has plenty of seats, but nearly all the window seats at tables were gone.
A couple showed up, asked if the other seats at my table were free. They were, and I told them so, and made sure my stuff wasn't encroaching on the space.
Then the man starts whining to his wife about he wants a window seat. Well, that's fine, there's a seat opposite me. And then he keeps on whining about how he's got to sit facing forward, in a tone of voice designed to carry to me and the woman at the table opposite. He was clearly expecting one of us to offer our seats to him.
I didn't even get to say "that won't be possible", since he didn't even ask. Since he wasn't addressing himself to me, I continued reading my book.
His wife found a pair of facing-forward seats and persuaded him back to them. Alas, they didn't have a table.
I had a lovely view and got some great photos, which is what I'd booked the trip for.