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02/28/2013 07:59 am ET Updated Feb 28, 2013

Tina Fey On Life After '30 Rock': 'I Feel Like I Just Got Out Of Prison' (VIDEO)

Tina Fey may have made the decision to end "30 Rock," but now that she has, she told "Late Show" she's not sure what to do with herself. After seven straight years of being cooped up in the studio for 18 hours a day creating and filming the show, Fey finds herself in a strange new reality.

"I feel like I just got out of prison and I don’t know how to act right," she admitted. Another strange side effect: "I keep getting in fights with people around New York City."

She detailed a specific fight she had at a Dunkin' Donuts that had her scratching her own head. It started when the woman behind her got frustrated, thinking Fey was moving too slow.

"The woman behind me was like, ‘Jesus Christ!’ And I -- just super short fuse -- was like, ‘Yes, is our lord and savior and we should pray!’" Fey said. "I was like, What am I?”

She also talked about her decision to definitely not host the Oscars, with or without Amy Poehler. This despite the fact that both women are at the top of everyone's wish list now.

Tune in for "Late Show with David Letterman" every weeknight at 11:35 p.m. EST on CBS.

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