Swearing in

I came across this tweet:
https://twitter.com/emilynussbaum/status/1082336816412454913
which asks what book one would be sworn in on, if not a religious text.

I love the variety and thoughtfulness of the answers -- from "The Hitchhiker's Guide to the Galaxy" (it says "Don't Panic" in big letters right on the cover!) to "A Tale of Two Cities" to "Everybody Poops."

Mine? "The Phantom Tollbooth." Easy.