"Consensual reality run amok," the thin man murmurs, half to himself. "Still, it offers you a way to strike at the enemy with his own weapon, should wit and nerve suffice."

Back to the idea at hand, though. "I ask again, was there some sort of tipping point? Did a rumor need to circulate for a certain span of time, or have been heard and believed by a certain number of people before it manifested?"