"I, Rob Schneider, a 1/2 Jew, pledge from this day forward to never work with Mel Gibson, actor-director-producer and anti-Semite," said the letter, which bore Schneider's signature.
The declaration was published as a full page ad in Thursday's Variety, an entertainment industry trade paper, e! Online reported Friday.
The untold joke of the letter is that Schneider and Gibson have never worked together before, with Schneider making comedies like "Deuce Bigalow: Male Gigolo" and Gibson making epics like "Braveheart," and "The Passion of the Christ."
Still, Schneider headed off any chance of collaboration with Gibson who reputedly railed against Jews during a drunken driving arrest July 28 in California.