Mostly harmless

From Dilbert. If anyone has the original, let me know.

Dogbert: Why do you waste your time reading books?
Dilbert: Because reading increases knowledge and knowledge is power.
Dogbert: But power corrupts, and corruption is a crime, and crime doesn’t pay. If you keep reading you’ll end up broke!
Dilbert: Wow! And it looked so… harmless.
Dogbert: Sure, that’s what booksellers want you to think!