"No!" Amy said. "Dan, you're lucky it was only concussive. You could've wiped out the whole Holt family." "And that would've been bad because...?"

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I want a room decorated with bones!" Dan said. "Where'd they come from?" "Cemeteries," Amy said. "Back in the 1700s, the cemeteries were getting overcrowded, so they decided to dig up tons of old bodies–all their bones–and move them into the Catacombs. The thing is...look at the dates. See when they started moving bones into the Catacombs?" Dan squinted at the screen. He didn't see what she was talking about. "Is it my birthday?

— Rick Riordan