It's April Fool's Day an Tomfoolery, one of my favourite books in my childhood came to mind. It collated all sorts of nonce and nonsense, including this old chestnut of a rhyme:
One fine day in the middle of the nightTo this day I can still quote that first verse by heart.
Two dead men got up to fight
Back to back they faced each other
Drew their swords and shot each other.
(Full poem here - also includes a discussion of variants and related folk poems)