If a meme washes ashore in the uncharted backwaters of the Internet known as DIARY-L, then I know it's being beaten to death. It used to be All Your Base. Now, it's, "When come back, bring pie."
Simply because it was a mystery to me, I feel compelled to post the link to the source as a public service to anyone else who tends to catch on to things a few months too late. (Everyone else, no doubt, has already beaten it into the ground.)
At least the guy behind this one knows how to make the most of all this.