Zendaya and Robert Pattinson 's new film "The Drama" is being marketed as a fun wedding flick ... but TMZ has learned that's a rom-com bait-and-switch -- and a dark plot twist is shocking the hell out of unsuspecting viewers. The movie, produced by A24, is about a couple, played by Z and Pattinson, who are a week out from their wedding when they play a game with friends in which everyone admits the worst thing they've ever done. And, when Zendaya's turn comes around, she drops a bombshell that'