Downloaded a sample?
While reading it you want to navigate to the cover image or TOC or anywhere else so you select the Menu and click without thinking, recalling that it was always the GoTo highlighted as default and .... voila, you have just bought the complete book!
For samples it's not the GoTo that gets highlighted by default when selecting the Menu but... BUY THIS BOOK NOW.
I have bought one book this way
Didn't return it.