According to
Airline ejects passenger for being hungry ? The Register
"United Airlines ejected a loyal first class passenger from a recent plane flight because he asked if he would be getting dinner. At least, that's his story. He may have been ejected because he's the sort of security threat who claims he's talking about food when he's really talking about the police."
Apparantly the FA misheard and thought he had asked if there were police on the flight, so he was taken off and rebooked on the next flight...
unbeleivable - he was a security threat on the first flight, but not the second...!