Get it? Cliff’s Notes? Depends on your age, I guess. I had to run this cartoon before the WWW destroys the Cliff’s Notes company, if it hasn’t already. One day, even drawing a book in a cartoon will make it look out of date. Like drawing a typewriter or a landline- it’ll only happen in Noir.
I’m not sure it’s a good idea to use bad puns in an independent bookshop unless you want to get thrown out like yesterday’s news.