Left image: A regular ordinary cap that is meant to shield one's eyes from the sun
Right image: A person wearing a cap backwards to look stylish. Sun is very brightly shining on their face, making them uncomfortable so they squint their eyes and use their hand to shadow their face from the sun.
This image is funny because a cap is MEANT to protect one's eyes from the sun, but this person is more interested in using it to look stylish, even if it makes them uncomfortable.