Time machine
Confirmed Real by Asimov
Curious after having invented the world's first Time Machine,
Roger Mulgulihan decided to unwittingly removed himself from
the timeline by answering the question: What 'does' happen when
you go back in time and kill your grandfather?
Newspaper reports show that a man suddenly appeared at 11:14 am
Thursday, January 15, 1942, in a brilliant flash of light,
only to kill another man and subsequently disappeared from existence.
At the time the incident was thought only to be mass hysteria.