Hmm, I think I'll move this to Intellectual Discussion.
Anyways, I guess it depends on what exactly you mean by it. Occasionally I'll quote something from a movie or TV show I like when the opportunity comes up in conversation. If it's brought up I would obviously acknowledge where it came from. Of course implying it as your own can be as simple as someone not being aware of the reference, but there's not much you can do about that. If the person defiantly was making it to be their original work than that's a different story, but I guess you have to look at the circumstance.