When you 're in a foreign country , here 's a fun game to play . Speak English among yourselves , even if you know the local language . That way , when the locals start badmouthing you or saying rude things about Americans , you can give them a good scare .

Possible answers: (1). None of the above choices .. (2). They want others to have a bad trip in another country .. (3). They want others to get themselves in trouble .. (4). They wanted to anger foreigners in other countries ..
Q: What may be the reason for this advice ?
(4).