There is a famous photograph of Albert Einstein sticking out his tongue, which has become an iconic image. The photograph was taken by Arthur Sasse on Einstein's 72nd birthday on March 14, 1951, outside the physics department of Princeton University.
The story behind the photograph goes that Einstein was attending a celebration in his honor, and he had grown tired of the constant requests for photographs. As he was leaving the event, a group of photographers gathered around him, urging him to pose for one last picture. Einstein, feeling playful and perhaps a bit mischievous, stuck out his tongue at the photographers just as Sasse captured the moment with his camera.
The photograph has since become a symbol of Einstein's lighthearted and eccentric personality. It is often interpreted as a reflection of his playful nature and his ability to not always take himself too seriously, despite his immense intellectual contributions to science.