Normally a link like this would be a mild curiosity and therefore kept to the Good Reads section of the site, but this simply freaked me out too much. This is a formula that when plotted draws itself!
Tupper's Self-Referential Formula -- from Wolfram MathWorld
Sorry for the lack of updates, but I have been off work (all forms) due to not feeling well, but this link couldn't wait. Will be back as soon as I feel better.