One Armrest Is Not Enough
The armrest was the measurement. It always is.

Armrest down
“Aisle seat.” You do not get an aisle seat at this cinema. She knew that. She said it anyway, in the queue.
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In January she put it down between them out of habit. In April she put it down, and twenty minutes later lifted it again, and neither of them said anything about it either time. The seats are all the same size. That is the entire problem with them.
Every stage of the sequence
- Armrest down. “Aisle seat.” You do not get an aisle seat at this cinema. She knew that. She said it anyway, in the queue.
- Armrest up. She held the bucket with both arms because one had stopped being enough for it, and did not brush the popcorn off.
She did not brush it off. “Get me another one.”