If you don't know what fallacies are, they are uses of invalid logic. These are most often used during arguments, in which case you should say "That is a fallacy; you are a moron." Just Kidding. That would be a fallacy called "Argument of Personal Attack." The correct thing to do is realize that you can't win the argument, for it is impossible to win an argument with a moron.
Here are some examples of fallacies:
Fallacies as defined by Scott Adams (writer of Dilbert comics)
I've confronted quite a few morons in my life, so I decided to put these confrontations on the web. This list will grow as I get in more arguments. BLUBBERING BUMBLEBUMS or maybe you prefer calling them JIBBERING JACKDOGS
Pictures are funny. Here are LoCuTuS' pictures, some of which are funny, but not all of which are clean. Allpics
I you like clean pictures, which is my personal preference, go here.