Left image: a person opening a door with the sign 'OPEN'
Right image: a person standing near a door with the sign 'CLOSE'
The image is funny because a person opens a door with the sign 'OPEN', meaning the place is open. However, once the person enters the building and looks back, the other side of the sign reads 'CLOSE', which ideally should not be the case, as the place is actually open.