In the nineteen-twenties, in a fabled city in the sands of Egypt, in a hidden tomb, a beefy American adventurer named O'Connell (Brendan Fraser) goes looking for buried treasure. With him are a studious but sultry librarian (Rachel Weisz) and her dim but cowardly brother (John Hannah). We already know that the tomb is booby-trapped by all manner of ancient curses, and, soon enough, the massed ranks of special effects arrive to take revenge. Stephen Sommers's movie has the courage of its own clichés; he piles the silliness on with such speed that you don't have the time to notice how dead and dusty most of his themes are. The characters barely make it to two dimensions, and the Arab figures that crop up at regular intervals are a disgrace; this is the most unapologetically racist comedy that Hollywood has produced in a long while. What redeems it is the presence of Fraser, who is having a ball just now; after his subtle, unshowy performance in "Gods and Monsters, he now successfully demonstrates how to be lusty and affable at the same time.