Perhaps you recall the UA flight out of Australia bound for Los Angeles on the 27th of July. It made news because they had a bomb threat and returned to Sydney. I don't recall hearing any more details. Until now:
Ninety minutes after taking off from Sydney Airport, a flight attendant on a United Airlines flight bound for Los Angeles found an airsickness bag - presumably unused - in a lavatory with the letters "BOB" written on it.
The flight attendant decided that the letters stood for "Bomb On Board" and immediately alerted the captain, who decided the risk was serious enough to turn the plane around and land back in Sydney.
In classic "Catch-22" style, this pilot and air crew were praised for their prompt action that resulted in the delay of their passengers and an additional $100,000 emergency landing fee to UA. "BOB" is common flight attendant jargon for "babe on board". There is but one explanation for the sudden leap one flight attendant made to decide it was "bomb on board", and why the pilot would agree with that conclusion. FUD Rules.
Sanity and security must not be mutually exclusive.