The Haunted Castle -- page 1500

It's Pip!!!

Then the old woman takes off her costume and stilts to reveal a little boy with horns, and goat legs, like the guy from the lion, witch and the wardrobe but shorter. "Hi he exclaimes. " My name is ppppp ip p p p ip mmmmate pppp pi pppppip..."

Pip continues on for a while like this. You and dave aventully go home.