Books like Cyclops Doesn't Roller-Skate

It's silly to think that Dr. Polly would be a cyclops, but he sure was acting strange. I don't think he would be a cannibal either, he was probably harmless...but nothing at all explained his weirdo behavior. Most of the story was Howie saying that he was going to prove that Dr. Polly was that legendary cyclops from that movie, but every single time one of them says, "I'll prove it!" It never happens. Ever. But it's not like Scooby-Doo I guess. I suppose it's supposed to make you really wonder if these "people" are really monsters or some sort of creature or not. Which is fine...but sometimes, it would be cool to find out for sure.