I don't get it. What are they trying to say? Hm...
It'd be nice if they'd use more words to tell me what point they're making. As I am a little slow, I would very much appreciate it if someone could translate this enigma for me. This is far too subtle for my mind to grasp.
Seriously, you could take all of the words out of this, every single one, and it would still be easy to infer. No signs, either. Just the step portion and the store with several guns displayed in the window. It would at least be serviceable humor-wise, then. Right now it's like when someone explains a joke after the fact. Annoying and unfunny.