[link|http://www.schneier.com/crypto-gram-0408.html#1|http://www.schneier....-gram-0408.html#1]
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.