Perhaps a really big sign that says...

Question

"Don't vote down an answer that is giving you a link saying that the question has already been asked dumbass!"

Comments

That is rude

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As hilarious as that would be, maybe word it a little more...civilly. Although, I agree with the general message.

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Trachy...... you crack me up sometimes

Answer 1

Well those questions would be hidden fairly soon anyway. But also in a future version downvoting will be restricted to people over a certain number of points so this should happen less.