Please post all quotes separately, so that they can be voted up/down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
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However, on the assumption that at least once in René's life he did indeed walk into a bar and refuse his regular drink in such manner (it seems possible), the premises and the conclusion are all true.
5billswift
Re-writing Descartes's "I think, therefore I am" as ("If I think, then I am" and "I think"); therefore "I am". Then the joke's "I think not" would be denying the antecedent, which is still a fallacy, of course.
Post quotes.