Melora Hardin came up with Jan’s devil horns on season four’s “Dinner Party.”
On season four, episode 13, “Dinner Party,” Michael and Jan (Melora Hardin) sit down for an excruciatingly awkward dinner with Jim, Pam, Angela, Andy (Ed Helms), Dwight, and Dwight’s former babysitter (Beth Grant).
As tensions rise, Michael and Jan break out into a fight in front of their guests as Jan tells a story about Michael running through their glass door because he heard an ice-cream truck.
When Michael points out that Jan installed the glass door, she quickly responds, “Yeah, I’m the devil” and mimes horns over her head.
“I just thought of it in that moment,” Hardin told Rolling Stone in 2018. “Steve’s reaction, he almost cracks up. If you watch him, he’s laughing and saying, ‘Yeah, yeah, you are the devil!'”
She continued, “He was sort of simultaneously almost losing it, because it was funny. When we cut, we all burst in laughter.”