When Paul Wolfskehl offered a prize of 100k German marks for Fermat's "last theorem", the University of Göttingen had to print generic rejection forms saying:

When Paul Wolfskehl offered a prize of 100k German marks for Fermat's "last theorem", the University of Göttingen had to print generic rejection forms saying: "Thank you for submitting a proof of Fermat's theorem. Your first mistake is on page __ line __."