The Book of Genealogy
The book of genealogy of Oming, the son of Raffy, the son of Tirso, the son of a gun:
x1 begot x2, x2 begot x3, and x3 begot x4, and soon other x's began begotting each other. Until such time when X got rated, Raffy married Cora, and bore four siblings, one of whom they named...Rommel...So all the generations from x1 until lim f(x) = n, where n = Rommel, are x generations...