One of my little hobbies is attempting to hold to sound logic when I make arguments. Not that I am very good at it. And one of the very best ways to learn how to argue, is to learn from the mistakes of others. It also helps you wad through much of the BS people throw at you (again, I'm not very good at it).
You can read more about fallacies here:http://www.csun.edu/~dgw61315/fallacies.html
Of course wikipedia has some information as well as just googling "fallacy(ies) of logic".
So, post the fallacies you see at GRS here. Not to embarrass the person (so leave their name out), but so we can all learn. Leave the arguments of the topic at hand within the appropriate thread. We're not here to make your point (or listen to you make your point), that belongs in the thread where the statement(s) originated. We are here to learn from your logical error (or a great display of logic!).
Please no bashing of people (as that would be an ad hominem) and please don't come in here and claim your fallacy if it is pointed out. Merely learn how you can improve.