"The alternative Hypothesis", by french novelist Eric-Emmanuel Schmitt.
I'm not a big fan of this other works, but I found this one pretty clever:
"On the 8th October 1909, Adolf Hitler was refused entry to the Fine Art Academy in Vienna. What would have happened if the jury had decided otherwise and accepted him? That decision would have changed the course of a life, the life of a timid, empassioned youth, the life of Adolf Hitler. But it would also have changed the course of the world."