I was curious about this little brain game, so I played along to find the joke. This is a dirty joke to play on someone like me wink.gif , agnostic that I am. So, I need to understand how this works...anybody?
When you get to the part when your eyes are closed, keep them closed until you are thinking, "I can't believe this"

http://www.funnyjunk.com/funny_pictures/2015/Sweet/
Sweet