It happens, but it isn"t always the same song. For me it is always "old"songs that I heard growing up, like maybe 8 or 9 years old. For some reason, I can remember the words, at least some of them, to those . Maybe cause I had older sisters playing the radio all the time. Ever heard "I Want a Bowlegged woman That's Tall"? That one will stick today until all the words come to me!