The only way that language can get you into trouble is when you insult someone or when you don't use the language properly. For example, if you don't speak a certain language pretty well, you might say something that doesn't mean what you thought it meant. Then, it means that to master different languages can only help you since it helps you to communicate properly with a lot of people. I don't think that language can get you into trouble except if you don't speak a certain language or that you don't use the words you know the way they should.
A personnal example would be that I've been working in a bus station in Rivière-du-Loup and even if we don't see a lot of English people in that town, it is inevitable that you will have to speak in English when you do a job like that. In fact, because I was good in English, I was hired more easyly. It also helped me to communicate with the clients better than the other employees.
Furthermore, it allows me to watch certain movies or programs on television that I can't find in french or that are badly translated from English to French. Most of the poker programs, for example, are in English and are presented on more chains than in French.
