Barbie and Oppenheimer, strike up the Band! Barbenheimer is nipping at your heels as it thumbs its nose at your posture. Heralded by a poster depicting a Barbie-doll silhouette against a nuclear-bomb armageddon, the upcoming B-movie by Charles Band threatens to go viral, if not radioactive, detonated by a combustive tagline like “D-cup, A-bomb.” The…