Smile,” the unsettling Paramount horror about grins, murder and suicide, has earned $2 million from Thursday previews at the domestic box office. On the other side of the cinematic spectrum, Universal’s “Bros,” a romantic comedy with entirely LGBTQ cast, has grossed $500,000. As the two movies face off at the box office this weekend, “Smile” is expected to earn the top spot over “Bros” and defending champ, “Don’t Worry Darling,” which has earned $25.5 million in its first week of release. The horror movie is projected to earn between $16 million and $20 million this weekend. Paramount will be smiling from ear to ear with a box office haul anywhere in that range, seeing as the low-budget fright fest cost a measly $17 million to make.