For the last few weeks, two of Hollywood's biggest stars have been staging a full-scale charm offensive. To promote their new movie "The Drama" — billed as a "contemporary" rom-com from cool-kid studio A24 — Zendaya and Robert Pattinson have been dispensing relationship advice , surprising newlyweds at a Las Vegas chapel , and popping up in New York City to foot the bill for a bride-to-be's dream gown , all in hopes of luring audiences to theaters. But something more sinister was brewing