If the back cover creates enough curiosity, you open it up and check the table of contents and maybe flip through a few pages. (booklaunchers.com)
If you have been consistent, early encounters will lead to familiarity and, eventually, enough curiosity for a potential customer to look at an ad or go into a store. (graduatedegrees.online.njit.edu)
This is a very powerful attention getter, and will usually arouse enough curiosity to get prospects to look further into your message. (simpson-direct.com)