/*
 * This code is rather messy, but I don’t have time right
 * now to clean it up as much as I would like.
 * But it works, so I’m happy. :-) jpw
 */

Source: Direct link to the source code
Software: OpenBSD
Programming language: C

/*
Most of this code was written while watching the Marlins sweep the Giants in the 1997 National League Playoffs – no Braves fans allowed to use this code (just kidding :-).

I realize that if I wanted to be true to the perl tradition, the only comment in this file would be something like:

…they shuffled back towards the rear of the line. ‘No, not at the rear!’ the slave-driver shouted. ‘Three files up. And stay there…

However, I really needed to violate that tradition just so I could keep track of what happens myself, not to mention some poor fool trying to understand this years from now :-).
*/

Source: Direct link to the source code
Software: Perl Source
Programming language: C

/*
uhhh…. i’ve commented this out. it was a great pervertion,
i know, but it could result in broken packets, and that’s
more f*cking than a simply crash. Relax.
*/

Source: Direct link to the source code
Software: QEcho
Programming language: C

/* okay, this is a mess. some 3d apps seem to try being */
/* unique, hello cinema4d & 3d exploration, feel good */
/* today?, and save this crap in tons of different */
/* formats. gah, those screwed coders. tho the */
/* wavefront obj standard defines exactly two ways */
/* of storing face information. so, i really won’t */
/* support such stupid extravaganza here! */

Source: Direct link to the source code
Software: osxnetradiant
Programming language: C

/* We changed phase but ESP shows bus service,
 * in this case it is most likely that we, the
 * hacker who has been up for 20hrs straight
 * staring at the screen, drowned in coffee
 * smelling like retched cigarette ashes
 * have miscoded something… so, try to
 * recover as best we can.
 */

Source: Direct link to the source code
Software: Linux Kernel
Programming language: C