We once had a local needs about donations, or rather the lack thereof, and the PO (at the time) started his talk by reading a letter from the WTS stating that we were now starting to tithe. After a few lines he stopped and said "Of course this isn't a real letter. If you ever hear a letter read like this, you know this isn't the Truth."
I sometimes wonder what he would do if, in fact, a letter to that effect was read someday. Would he remember his own words? Probably not.