This is more of a hack than coding, but I owed the school library money for a lost book in grade school. I didn't have the money and didn't want to to tell my p

This is more of a hack than coding, but I owed the school library money for a lost book in grade school. I didn't have the money and didn't want to to tell my parents about it, so I studied the library system. It was a self-check in, check out system with a scanning wand. You take your book, log your student number, scan the barcode, and it was added to your account inventory. Returning the book was the same way; but if you didn't have the book, you obviously couldn't scan it back in. I figured out you could look up the book's ISBN through your account inventory, write it down, and manually enter it into the return form. BAM! Lost book was magically returned :D. I told a few friends about it, I'm sure the school lost out on a few hundred dollars worth of books that year.