There's a popular joke that goes

What's Yellow and Dangerous ? Shark infested Custard. O.K, so it's not that funny, but when Harry Hill heard the joke, he just had to make a childrens comedy show of it, so he did. Harry Hill's Shark Infested Custard has 13 episodes, and you can watch it on ITV, CITV and Cartoon Network. So far, there have been two novelations of the show, both written by Harry Hill. They are called Harry Hill's Whopping Great Joke Book and Harry Hill's Bumper Book Of Bloopers. You can watch clips from the show here