/* Jeez, this is an ugly mess */

...comment from the X11R6 internals source code circa 1991.

我最喜欢的是这样的

 # commented out
 ...
 ### end of the formerly uncommented #2001-02-22 John Doe

long john; // silver

//休斯顿，我们有麻烦了

/* This is O(scary), but seems quick enough in practice. */ 

后面是四个嵌套的for循环

// This code was written by a genius so don't try to understand it with
// your tiny little brain.