Great when someone compliments you on a song, and you have to congress it was one of your own, as Micca said.

But it can be good too when they compliment you and assume it was one of your own, and you tell them written by someone universally recognised as a great songwriter - and they thought it was one of yours. (The same if it's a traditional song they hadn't come across before.) And the best thing is to walk into a room and someone is singing one of yours, and they don't know.