Trains.
She sat here alone on the train crossed legged and reading. Suddenly, the train lurched, and she found herself stumbling forward, dropping her book unto the dirty tran floor.
Shite, she scrambled to grap it, but the train suddenly slammed the brakes and she, along with her precious book, went tumbling along.
By the time she was able to right herself and, after finding it underneath a dirty seat, grap her book, she quickly remembered why she hated trains so.