The It reboot's new Pennywise, Bill Skarsgard did a great job of traumatizing child actors on the set of It.

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Speaking with his brother, Alexander for Interview Magazine , Skarsgard revealed he "wasn't very friendly or goofy" during filming and tried his best to make Pennywise as creepy and weird as possible when he was in full makeup.During the filming of one particular scene, Skarsgard made several child extras cry simply by looking at them. While some "were really intrigued" by Skarsgard's makeup and clown outfit, others were shaking. "I am completely in character," said Skarsgard. "So some of these kids got terrified and started to cry in the middle of the take, and then I realized, 'Holy s**t. What am I doing? What is this? This is horrible.'"However, right after filming stopped Skarsgard made sure to apologize to the child actors. "But then we cut, and obviously I was all, 'Hey, I'm sorry. This is pretend,'" said Skarsgard.It opens in theaters on September 8. While you wait for the film's release, check out IGN's explanation of who Pennywise is exactly and what we think are the nine scariest things in Stephen King's horror novel

Alex Gilyadov is a freelance writer for IGN. You can follow him on Twitter