A terser and slightly profane version of A. G.'s comment on generalizations came from Oliver Wendell Holmes. "No generalization is worth a damn--including that one."
Steve,
I like it. On a similar line, I was said to my pastor, "Everything in moderation."
To which he replied, "Including moderation."
(He's the same guy, who, upon my saying, "Imitation is the sincerest form of flattery." said, "No, I think burglary is.")