In Which Graduation Can't Come Soon Enough

My Sister: "Someone called and said that they'd planted a bomb on the football field."
Me: "Cripes. So that's far enough away from the school they won't even let you out of class or anything?"
MS: "Nope. The principal said that it was a trick to get us to stay in the school where they'd really hidden the bomb."
Me: "So what did they do?"
MS: "They evacuated us to the football field."