Carolina Panthers center Ryan Kalil paid for a full-page ad in the Charlotte Observer, an audacious letter to fans guaranteeing that his team would win the Super Bowl this season.

Though some are writing it off as foolish, the letter is nonetheless inspiring, and other players around the league have apparently followed his example and taken out newspaper ads of their own making similarly brazen promises.

Playbook's dubious network of sources collected some of the more inspiring letters. Take a look:

Illustrations by Kurt Snibbe