This is really the embarassing little secret that KYM doesn't like to talk about, or doesn't know. The rage face is based on KC's comic, yes, but the meme itself originated on KYM, the very site that repeats over and over that it is not for creating memes.
The user Teh_Mudkip did what every new user (who isn't familiar with the rules) does, he created a "meme" of his own. The rage face and the strolling stick figure. In the original entry he himself said that he created it, he created and added the images. But because KYM is a popular site it did catch on on 4Chan, slowly but inevitably.
That was in 2008, I didn't save a screenshot so this doesn't really sound legit….but there were other users who saw it and can support my claim (if they are still active).
Edit: Okay discard the thing about Teh_Mudkip. I'm an idiot. He wasn't the one that created the meme and the original entry (since he joined a year ago, so it couldn't be him). But still, the meme did emerge from KYM.
Well, alright, I can't remember when it exactly began, but it did begin here.