During an appearance on Jimmy Kimmel Live, the New Girl star confessed that Emily used to scare her as a kid by reenacting scenes from scary movies until their father intervened.
"Emily's four years older, which is a very vulnerable amount of years. Because when I was 3, she was 7, and she was already evil. She basically just used the plot of Invasion of the Body Snatchers to terrify me - and a very over-the-top performance, might I add," Zooey recalled.
"The Neptunians had killed my real sister and replaced her with a facsimile who looked just like her, talked just like her, but when my parents weren't in the room, made crazy faces at me and talked like Vickie from Small Wonder."
Zooey continued: "I was terrified. She would make me cry and then my dad would come in and try to mediate, and then she would laugh."
Last year, Zooey insisted that she does not feel any sense of competition with Emily and is pleased for her sister's success.