Left image: A banner that says "Drink more water" with an image of a jug pouring water into a glass.
Right image: a very long queue in front of the public toilet
The image is ironical, as the message "Drink more water" is meant to improve health, but in turn, it would lead to longer queues in front of public toilets, leading to people holding urine for longer periods, in turn leading to deterioration in health.