This sounds similar to the rumor that went around right before the Zone Visit in 2014: brace yourself, your faith could be shaken.
I suppose the "faith-shaking" event there was watching one of "Christ's Brothers" impart critical information about living in the end of the end of the end of the end of the end of the end of the end of the end of the end of the end of the end of the end of the end of the end of the end of the Last Days:
"Beware of tight pants."
Yes, "faith-shaking" indeed.