S
Sunseeker
Guest
You could call for a Charisma(Investigation) check. If you're a player, then at at least ask "hey, can I apply my Investigation skills to that Charismacheck?"
Although I dislike SAD characters, I do like the more general skills over the more specific ones, because it gives more room for my players to make a reasonable argument that their skill in *SKILL* should be applicable to whatever they are attempting to do.