Every game I look at my Halfling Paladin's languages of Common and Halfling and go "one day this will be useful" as the rest of the players laugh. My local Venture Captain said he remembers only one time it ever came up, and he's played almost everything.
I have managed to make it a role-play thing though, my Paladin hiding his bad cussing habit using Halfling to do so instead of Common (he behaves like a bible camp councillor otherwise.)
Anyone else suffer from this feeling of frustration?