Richard felt his body shrinking smaller and smaller, soon he was swimming in his own clothes, his sleeves stretching beyond his own arms.
He heard a mans voice screaming from his sons room and ran to the room as best he can fearing the worst. Using his hands to hold up his pants and nearly tripping over his trailing pants legs he ran to his sons room and saw... himself?
His body was standing their naked among torn clothes holding a book. A look of shock over his face.
"Daddy, I'm sorry... I didn't mean to... I didn't know the spell would really work," Bobby said in a paniced voice.
Richard took a deep breath trying to calm down. "OK, if the spell gave us each others body it should be simple to cast it again and fix things."
... obviously that didn't work as he is selling the book online, but WHY didn't it work?