Weezerpedia:Today's featured song/September 24, 2008

Say It Ain't So was one of the earliest Weezer songs to be written. Originally, Rivers had written all of the music and had only the line "Say it ain't so". Rivers made the connection between the line and an experience he had in high school where he came home to find a bottle of alcohol (belonging to his stepfather) in the refrigerator. Rivers recalled that around the time his first father left, he started drinking. He began to fear that Steven, his step father, would soon leave his mother much the way his father did.