If you ever wondered what Geeks bearing gifts would look like....
I recently encountered a couple of wonderful pieces of musical notation on Facebook. Both decode to give "Happy Birthday To You". Here is the first, which uses accidentals to achieve its effect. In this one (by Makito Hattori) the notes appear to go up and down in ways contrary to the actual tune.
The next one, on the other hand (from Classical Music Humor) consists of notes all of which lie in the same places (over three octaves) on the stave. No accidentals here: what drives out the tune is imaginative use of clefs:
Both are wonderful.