A friend of mine showed me this website, How to Write Unmaintainable Code, it looks really funny although I have only read a bit of it.

Single Letter Variable Names: If you call your variables a, b, c, then it will be impossible to search for instances of them using a simple text editor. Further, nobody will be able to guess what they are for. If anyone even hints at breaking the tradition honoured since FØRTRAN of using i, j, and k for indexing variables, namely replacing them with ii, jj and kk, warn them about what the Spanish Inquisition did to heretics.
I found this part really funny!

http://mindprod.com/unmain.html