Somewhere in fall of 2000 I wasted ten minutes and cut-and-pasted together an image showing some of the other ways that Microsoft's Clippy might like to help you. By giving completely inappropriate advice. I figure this thing cost the world quite a bit of productivity as it wandered through various corporate email systems. And I admit to taking some pride in that.
At one point it was a Slashdot Quickie. These days it's mostly been seen in the company of similar spoofs usually titled, Things you wish your computer had.
A couple of people have accused me of just copying the joke on this page (scroll down about halfway). Just a coincidence. If two people can come up with the foundation of the Special Theory of Relativity, two people can come up with the same joke.