To add to the LD ones in the opening post: "ABCWXYZ The cat's in the cupboard and he don't see me".
These nonsense lines, used to keep going songs which are really only a chorus (like "Don't you rock me daddio")are different from lines reused in "proper" verses like "Woke up one morning" or "As I was a walking". The Weavers' favourite of the first kind was "Alas my love you do me wrong/To treat me so discourteously".
RtS (speaking from the depths of my ignorance)