Guilt by Imagination was the eighth episode of Season 6 of Roseanne, also the 130th overall series episode. It was written by Michael Borkow and Stevie Ray Fromstein from an original story by Lois Bromfield and was directed by Phillip Charles MacKenzie. It originally aired on ABC-TV on November 9, 1993.
Dan has lunch with old flame Phyllis Zimmer (mentioned in the 1st-season episode "The Memory Game"), and has trouble keeping it from Roseanne and Jackie, who suspect his motives. Guest-star: Vicki Lawrence (Mama's Family, The Carol Burnett Show).
An old fling of Dan's, and old nemesis of Roseanne's from high school visits Dan at the City Garage, and invites him out to lunch. Jackie finds out from Fred, lies to Roseanne about where Dan is, confronts Dan at home later that evening, but believes him that it was only an innocent lunch. Unaware of how Dan spent his lunch hour, Roseanne confides in Jackie that Dan played hooky that afternoon, and the two of them had the best sex ever. Thanks to Jackie's inability to lie convincingly to Roseanne, she realizes that she has been lied to, forcing Dan to come clean about who he spent his lunch with. Enraged and humiliated, Roseanne walks out on Dan.