Really? No one has given the Earshot factoid yet? Well I guess Cyclo breifly mentioned it, but I think he may have the order of events wrong.
So here's the deal, Earshot was set to air the week after the Columbine shooting. That's right, this episode wasn't written because of Columbine like many people think, it was written and filmed before the shooting occured. Oops! As you can imagine the network pulled the episode and it didn't air until 6 months later. They aired it for the first time the week before season 4 began.
Joss marveled out how horrible the timing of that episode would have been.
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"Hope is allowed to be stupid, unwise, and naive." ~Sir Chris