During the filming of the 2013 comedy This Is the End, Michael Cera wanted the scene where his character slaps Rihanna’s butt to look real on camera.🎬

He asked if he could actually do it. Rihanna agreed, but only if she could slap him back across the face for real. They filmed the exchange three or four times. On the fourth take, the one kept in the final movie, Rihanna hit him so hard that she cupped his ear and knocked his equilibrium off balance. Cera had to lie down in his trailer for around half an hour to recover. Director Seth Rogen later confirmed Cera was probably concussed from the real slap. Cera himself said he encouraged the hard hit because a fake one wouldn’t look funny, and the genuine reaction is what audiences see on screen.