Bloopers & Behind The Scenes on Instagram: "While shooting This Is the End (2013), the wild Rihanna–Michael Cera moment didn’t land at first. Cera kept faking the slap, stopping just before touching her, but the cramped set and weird camera angles made it look obviously staged. So he asked Rihanna if she’d be fine with taking a real hit for the shot. She agreed — on the condition that she could smack him back across the face after every take. Cera didn’t think twice… until she started hitting ha