Languages in Role-Playing Games

Do you use your languages in role-playing games still? You know I don't play nearly as often as I used to for one thing but it's not really like I'm trying to think of any decent examples. To all of the languages that I've made that I am still that I haven't destroyed yet with the exception of the most recent one they all do exist in the same con world. So theoretically you know if I ever ran a game again in that setting all the languages would be there and be present and the players could interact with them. But I'm just not really sure what the best way of doing it would be.