Blaming ATC...
A couple of years ago a pilot did a PA to his passengers after a go-around at Gatwick saying that 'ATC had made a cock-up' - not the case at all, unfortunately for the pilot the PA had actually been transmitted to ATC instead of the cabin by mistake. He later apologised!
Also, any passengers flying with United Airlines usually have the facility to listen to all the RT communications from their seats, except during PAs!