Messages should be polite.
Perhaps
"You may not edit other people's posts. Perhaps you have forgot to logon or perhaps you are using a different account? If so you can login at..."
or
"This post does not exist."
"bastard", "distry rotten pig" aren't decent error messages.
useradd
more /root/Forums and Website/Error Messages too Elegant.thread
It would not be productive to our user base to be that indecent. A little joke here and there is understandable, but calling people names every time they get an error message is a blow below the belt that would reflect poorly on us.
when a program/website has 'nice' error messages that are informative the user is less likely to stop using your program/website i think this is how a error should look...