I wasn't going to submit but decided at the last minute. Co-worker had some old Far-Side calendars. I glanced through it and found one that I could do with the help of my son. I did not do any fancy editing since I am still learning PS.
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The sign on the door kills it. The physical sign that is, I know that's the key to the joke. Perhaps if you had found a school or business door to use.
I am disappointed with your "pull" sign..... simply a piece of paper stuck on, and in an unlikely position. With a bit more effort, this would have been much more impressive.