//Magic. do not touch

I've stumbled upon this hilarious post in stackoverflow under the title of "What is the best comment in source code you have ever encountered?".

As the title implies, this was my favorite!
I also like this one as well :)

// 
// 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 = 16
//