RICHARD JOHNSON - My Grandpa's Amazing Inventions

When Grandpa is invited to take part in The World's Latest and Greatest Inventions Contest, he can't think what to make! A Deep-Sea-Tentaclon? A Multi-Action-Dirtoid Digga? Mechanical Flip-Flappers?
Finally he decides. His invention is amazing-ofcourse! But it's what he comes up with next that's best of all!