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Named Rat Rat. (“Original!” says Robbie.) It was given to her by Jared Leto, or rather, Jared Leto’s character in the upcoming Batman flick Suicide Squad, in which he plays the Joker. Several crew members suggested killing it, but Robbie kept the rat because, “If Harley [her character in Suicide Squad] got something from Joker, she’d probably cherish it.” Rat Rat now dines on organic berries from Whole Foods.
From Batman News: