Rick was writing the book and eating chicken with tarter sauce. The tarter sauce was in a jar and Rick was leaning over the tarter sauce and tapping the pencil to his head, thinking about a good part that could happen next. And his hands were greasy from the chicken and the pencil slipped out of his hand and it feel into the tarter sauce. Then Rick thought "Percy and Annabeth could fall into Tartarus!" So that's how that happened O.o
