Grandfather paradox.

Hanaan stood before his grandfather, gun trembling. Suddenly, he felt himself dissolve into nothingness. The gun remained, frozen in mid-air, a haunting testament to a paradox that had consumed its creator before he could even act. It was all in his mind. He was a weak man and could not control his nerves. If he had enough courage to get himself out of the paradox, he would have pulled the trigger. Instead, he let himself be consumed in the chaos leading to absolute nothingness.

I own the picture.