Ok, first I apologize. I was drunk when I started this thread, and didn't mean to troll around claiming my superiority just because I was a geek in the early 90s.
But these two clips are totally memes. They may not have had an equivalent impact upon the mainstream as many others, but that's largely because the "societies" in which they circulated were largely hidden or unheard of in the mainstream at the time. Just the fact that the sheep video can still be found is a testament to its durability, not just as a stupid sight gag, but as a quaint historical reminder of the developing era just slightly prior to the dominance of web browsers.
Ok, I'll admit the sheep video probably doesn't deserve an episode of Know Your Meme. But to me it provides a sort of meta-commentary on the meme of internet memes themselves, being one of the earlier pieces of media to spread around the country in this fashion. And a show devoted to exploring the history and weirdness of obscure online social phenomena should mention it somewhere at least.
As for duckjob, google "I'll go get you a towel." There's still a fanbase of aging nerds who play it at every house party they can… I managed to find a number of derivative videos.
They're stupid derivatives, but still evidence that duckjob is a mind-virus that has survived the dark ages.
There was plenty of imitation among my friends based on it, short animations, recorded impressions, etc. And I'm sure other circles of people were doing the same, but without the dissemination model, video compression, and high bandwidth of today, most of that has been gone for a long time. YouTube remixes don't define the word meme.
Bah, I've wasted enough time with this.