He took a simple idea that already existed (whether he was aware of it or not doesn't really matter) and created a new idea from it. I hate to break it to you, but that's actually how creativity works. There's no such thing as completely original ideas, it's all just people building on what's come before.
I'm aware that's how creativity (usually) works. I thought that given the title of the thread (i.e. zach is unoriginal) you folks would recognize that my post was not meant to be a slight against Zach's considerable creative talents, but to point out, as you said, that his idea was not completely original. I happened to notice that the idea for the day's comic had been used before, and thought that this thread seemed like the right place to point that out.
You know what? Maybe when people tell us how unoriginal Zach is, we should link to the millions of other people who've said the same thing. To show them how original they are, yes?
It seems like it should be pretty clear to anybody posting in a thread called "zach is unoriginal" that they were not the first to notice his work occasion contains themes that existed before he used them. So your idea seems a bit redundant to me. My goal was not to be original, I mistakenly assumed that this thread was meant for posts similar to mine.
Y'all take things pretty seriously for members of a forum based on a comic made up largely of dick jokes.