Meaningful endings lead people to experience mixed emotions, but it is unclear why. We hypothesized that it is in part because meaningful endings lead people to reminisce on good times. In Study 1, college students who took part in our study on their graduation day (vs. a typical day) reported having spent more time that day reminiscing on good times. Moreover, reminiscence on good times partially mediated the effect of graduation on happiness, sadness, and mixed emotions. In Study 2, we asked undergraduates to reminisce on good (vs. ordinary) times from high school and found that reminiscence on good times elicited happiness, sadness, and mixed emotions. In Study 3, we found that reminiscing on good times that were not (vs. were) repeatable elicited especially intense sadness and mixed emotions. Taken together, results indicate that reminiscing on good times, especially good times gone, elicits mixed emotions and that these emotional consequences help explain why meaningful endings elicit mixed emotions. (PsycInfo Database Record (c) 2022 APA, all rights reserved).