Story: A girl, Sabrina, meets two friends at Walmart. Chuck and Andrew are waiting for her at 1 pm. She knows one of them is gay. She can't remember who. Andrew never tells the truth and is a pathological liar. Chuck cannot tell a lie. She comes up to them and says, "Which one of you is gay?" She is not looking when one of the two responds, "The other one says I am straight."
Enigma: Who is gay?