If you loved L'empreinte de la Mort, try Deux nigauds et l'homme invisible

What Deux nigauds et l'homme invisible is

Boxing ring, late show, a bell. Mumbling chumps Wilbur and Bud bungle into a bizarre case: a fugitive prizefighter injects himself with a serum to evade the law. Universal leaned hard into horror-comedy team-ups by then.