The truth of it all
One day, a man is riding through the desert on his horse, he falls off his horse and hallucinates - maybe it's concussion, maybe it's mirage brought on by the desert heat, maybe it's Maybelline - who knows? Yet, because of this, because of this concussion / hallucination, an entire religion changed course overnight. Because if it hadn't been for this guy, Christianity would have probably stayed a Jewish cult (at least for a lot longer than it did under the ministrations of the man directly responsible for abolishing the necessity of keeping to kashrut and saying it's okay for gentiles to join).