The fifth episode of the Johncast!

Credit to Kevin MacLeod for his awesome music from Incompetech, including Overworld, which I used in this episode.

"Overworld"Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 3.0http://creativecommons.org/licenses/by/3.0/

Thanks to audioblocks.com and orangefreesounds.com, for the awesome sound effects and music.

Here is the riddle's answer: A chalkboard!