I saw this on stackoverflow while Googling for a C program that was shaped like a diamond and actually compiled and ran. Had a few laughs, mainly because some of the comments these guys write hit so close to home
I frequently have no idea what I coded after I coded it and sit there wondering WTF.
http://stackoverflow.com/questions/...ment-in-source-code-you-have-ever-encountered
A few of my favorites:

http://stackoverflow.com/questions/...ment-in-source-code-you-have-ever-encountered
A few of my favorites:
Code:
//
// Dear maintainer:
//
// Once you are done trying to 'optimize' this routine,
// and have realized what a terrible mistake that was,
// please increment the following counter as a warning
// to the next guy:
//
// total_hours_wasted_here = 39
//
Code:
/*
* You may think you know what the following code does.
* But you dont. Trust me.
* Fiddle with it, and youll spend many a sleepless
* night cursing the moment you thought youd be clever
* enough to "optimize" the code below.
* Now close this file and go play with something else.
*/
Code:
/**
* This method leverages collective synergy to drive "outside of the box"
* thinking and formulate key objectives into a win-win game plan with a
* quality-driven approach that focuses on empowering key players to drive-up
* their core competencies and increase expectations with an all-around
* initiative to drive down the bottom-line. I really wanted to work the word
* "mandrolic" in there, but that word always makes me want to punch myself in
* the face.
*/
private void updateFileCountLabel() {