I can relate one that I thought was kind of funny. . .
A while back, a rumor started at the Everett Boeing plant that Delta was so unhappy with the quality of Boeing's paint jobs that they were not allowing Boeing to paint anymore of their aircraft - they would all be done by outside contractors or Delta themselves. If you asked anyone who worked there, they'd tell you this.
The source? Boeing delivered a 777 to the airline unpainted at Delta's request. Why? Because they were introducing their new livery, and wanted it to be kept a secret. So when the plane was delivered unpainted - BINGO - new rumor.
It's really amazing!
Of course, some rumors end up being true. For instance, I knew before they were officially announced that JAL, ANA and AF were ordering the 777LR. I also heard rumors (later they were, for the most part, substantiated) that QF, ANZ and EK were also all very close to signing for the planes, but changed their minds or delayed their decisions at the last minute.
Honor the warriors, not the war.