But Not All Code Starts From a Clean Slate

How many of you have seen a comment like this?

/* I have no idea how this works but it seems to.  Whatever you  
   do, don't touch this function, and don't break this code! */

Entire systems are sometimes ruled off-limits because no one understands them; yet these systems still need to be maintained.

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Copyright 2005 Elliotte Rusty Harold
Last Modified July 2, 2006