A man walks into the library.
Man: "Excuse me. Could you point me in the direction of the Immaculate Conception Church on Maria Avenue? I've seen it once or twice, but I can't remember how to get there."
Librarian: "Well sir, there is an Immaculate Conception Church about three blocks north of the library, but there's no street named Maria anywhere around here."
Man: "That can't be right. I distinctly remember a sign out in front of the church with the street name along the top."
Librarian: "What exactly did it say sir?"
Man: "Well, they actually had it backwards for some reason, so that it read 'Ave Maria'."