We finished a crossword on a stalled MARTA train and never missed a week

The MARTA train stopped between stations for twenty minutes on a Thursday and a woman next to me folded her newspaper to the crossword and said, I am stuck on seven across. I knew it. She knew twelve down. By the time the train moved we had finished it. We got off at different stops and promised to meet on the same train next week. We have not missed one. I do not know her name. I know how she writes her sevens.