A man slips behind someone else into a packed elementary school with AK-47 type weapon. He goes into the office and shoots at the ground, then darts between there and outside to fire at approaching police.
So what do you do?
A man accused of opening fire at an Atlanta-area elementary school this week had been arrested five months earlier on suspicion of threatening to kill his brother, a district attorney in Georgia's Henry County said Wednesday.
Back in 1982, Chelsea McClellan -- just 15 months old -- needed immunizations.
It was routine stuff, so Chelsea's mother took her to a local clinic in Kerrville, Texas. What happened there was anything but routine.