brain donors (1992) is an american comedy film released by paramount pictures, loosely based on the marx brothers comedies "a night at the opera" and "a day at the races" (the first two films the marx brothers did after leaving paramount). the film co-stars john turturro, mel smith, and bob nelson in the approximations of the groucho, chico, and harpo roles, with nancy marchand in the margaret dumont dowager role.