My Talent would be saying things that come out the wrong way. Often it can offend people.
Example
Friend: Ugh, I look like crap today!
Me: It's okay, I do too!
Friend: Too...?
Me: Oh, shoot...
When a Librarian is coming at me I can say something like "I like your hair," but it would come out like, "Your hair is crazy." Then they will be stunned, causing them to have a reaction they weren't expecting.