If anyone read Walt's AMA, he kept referencing a crane. Look at the napkin. I think the cup kind of looks like him wearing the hat but I may just be seeing things.
Anyway, new background: http://i.imgur.com/NEejJ4L.jpg
"You clearly donít know who youíre talking to, so let me clue you in. I am not in danger, Skyler. I am the danger. A guy opens his door and gets shot, and you think that of me?
No! I am the one who knocks!"