This is cool, the escalator has been turned to look like an iPhone screen with a whole range of apps. This is advertising apples endless apps. It would be hard to miss this whilst you are travelling up the escalator.
Potatoes growing out of the ceiling in a tunnel. It's an ad by Lays: 'our potatoes are grown closer than you may think.' Could be an interesting street art concept, hanging growing stuff in subway tunnels etc.
The advertising posters that think they're street furniture