SPIKE Milligan's lifelong dedication to making people laugh has inspired his son to create some crazy characters of his own. James Milligan's 'A Book Of Poems For People Under 4ft 2"' would bring a smile to the face of his old man. The quirky cast of 'Hubert Humperbump', 'Matilda the Python' and 'Clever Emma' would not be out of place in the irreverent work of the legendary comedian. James, 49, created them for his only child Robert, now 21, when he was a toddler. The collection has grown over