Logical fallacies update: James Dominguez adds these to the earlier list.

Denying the Antecedent:
If Denying the Antecedent were not the best fallacy, then I would be sad. I am actually in quite a good mood right now, so obviously Denying the Antecedent is the best.

Affirming the Consequent:
If it is proven that Affirming the Consequent is the best, then I will be very happy. I am feeling _very_ happy, so obviously Affirming the Consequent is the best fallacy.

Straw Man Argument:
Apparently you think the Straw Man Argument is bad because you have something against the Wizard of Oz. Well, you know what? It doesn't have anything to do with the Wizard of Oz! Therefore, the Straw Man Argument must be the best fallacy.