Rustling the bag she had previously crumpled tightly in her hand, she
produced a sealed bottle of water. He realized he was staring at her.
This wasn’t the done thing on the tube, so he forced himself to look
away.

When he glanced back, a curious exercise was under way. The
woman was stabbing ferociously at the bottles plastic seal. She seemed
to be trying to break each strand of plastic attaching the band of
plastic to the lid. He found her actions compelling viewing.

Slowly and systematically she broke each strand. After what seemed like an
age, she finally freed the parts and triumphantly twisted off the lid.
Taking big gulps of the fluid, a wry smile of victory filled her face.
Suddenly he realized it was his stop. He jumped to his feet and made his
way on to the platform.