I'm trying to find the titles for two children's books I read as a kid. One was a book that was a large, thin, hardcover book that featured a man who lost his head, and tried various things like a banana, a carved wooden head, etc. He woke up after someone kicked him in the head (yeah, violent, I know).

The second book was also hardcover, thin (I guess most kids books are) and featured some kind of room like an empty theater room, which these 5 kids were imagining what might be in the room - some imagined monsters, or some kind of wild musical instrument.

It's been bugging me for years to find these books again. If anyone had any ideas please post a response..