Today, programmers, let us celebrate all the varied and wonderful facets of code commenting: an art that too few of our brethren bother with, and even fewer master. Those who do stand to leave their mark on untold generations to come!

There are the comments that make us laugh out loud, as Hopsas illustrates:

//  ( 

http://thedailywtf.com/articles/a-comment-on-comments