Left image: The weather during weekdays is sunny, shown using an image of the Sun.
Right image: The weather during weekends is rainy, shown using an image of a grey cloud with water drops.
The image is funny, as the weather is sunny during the weekdays, which are generally the days when people work in a job. People look forward to go outside and enjoy in the weekend, but due to an unexpected rainy weather, people will not be able to go outside.