When Henry's mum wakes up with a horrid headache, Henry decides that he is just the hippo to make her feel better. With Henry in charge, having a headache is the least of Mum's worries.When Henry's mum wakes up with a horrid headache, Henry decides that he is just the hippo to make her feel better. With Henry in charge, having a headache is the least of Mum's worries.