Much love for the Ha! Ha! Webtoy. I've seen it used in Fark comments a few times, and finally got around to checking it out. Karen and I are having fun aiming "Ha! Ha!" at each other. I wish I knew where the original graphic came from.
I also wish it supported apostrophes, alas.
Edit: The above graphic wasn't one of the ones I aimed at Karen; it was inspired by an anonymous message I received from someone who can't tell the difference between parody and reality.