Grohl states that he wrote this song about the death of Kurt Cobain, the lines "Came without a warning" are a reference to the shock of his suicide. However, when he thinks about it deeper he realizes that maybe it wasn't such a shock after all and he should have seen it coming, hence the line title, "I should have known". Krist Novoselic plays the bass and the accordian on this recording and a violin is also used. P. S. No, Courtney did not kill Kurt.