I talked to an Irish guy who did something like that once. He was flying a British Airways (UK state airline) flight into Belfast at the height of the northern ireland conflict. He read off the usual spiel "This is your captain speaking, we are now on final aproach. Local time is blah blah, weather is XYZ etc." Then when he was done, he read the whole thing out again in Irish as if he was flying Aer Lingus (Irish state airline). After he landed he stood out in the corridor and said goodbye to the passengers as they left. He said he could tell immediately which side each of them were on by how they reacted. Some of them must have complained because when he got back his boss told him never to do that again.