Claim: Macbeth won the Grand Prix at the 25th Cannes Film Festival.
Evidence: Polanski 's Macbeth was screened out of competition at the 1972 Cannes Film Festival.
The Grand Prix is an award of the Cannes Film Festival bestowed by the jury of the festival on one of the competing feature films.
The 25th Cannes Film Festival was held on May 4 -- 19 , 1972.