Heh, sometimes that shuts them up. The hard ones are the ones that are high, over the top of the batter's strike zone. Easy call when the catcher has to lift his glove, but I usually get the "stoopid" question. My answer: If you had to lift your glove to show me your amazing catching talent, you should know the answer to your question by now." (Yes, smartass answer, but developed from being a college instructor!)