Far and away the most valuable celebrity autograph has a very tragic story attached to it. In 1980, John Lennon stopped to sign a copy of his album Double Fantasy for a fan named David Mark Chapman.

Autographs from A-list celebrities, athletes, and iconic performers are big business. A signed movie script, jersey, or album cover can sell for hundreds or even thousands of dollars.

Justin Herbert played some golf over the weekend for a good cause. But that wasn't the most notable thing the Chargers quarterback did. Herbert partook in the AmFam Champ Celebrity Foursome in ...