Once I knew how to check the background on my PC, I changed it to the picture below.
I thought I was so cool, until a customs officer in the US asked me to turn on my laptop, after he he swabbed it. Luckily he didn't really look at it hard, otherwise I might have to do a lot of explaining.
I was just thinking it would be cool to read this book on my kindle, however I could believe that the US border control would check a kindle.