We explored a counterintuitive approach to increasing happiness: Imagining time as scarce. Participants were randomly assigned to try to live this month (LTM) like it was their last in their current city (time scarcity intervention; n = 69) or to keep track of their daily activities (neutral control; n = 70). Each group reported their activities and their psychological need satisfaction (connectedness, competence, and autonomy) weekly for 4 weeks. At baseline, post-intervention, and 2-week follow-up, participants reported their well-being-a composite of life satisfaction, positive emotions, and negative emotions. Participants in the LTM condition increased in well-being over time compared to the control group. Furthermore, mediation analyses indicated that these differences in well-being were explained by greater connectedness, competence, and autonomy. Thus, imagining time as scarce prompted people to seize the moment and extract greater wellbeing from their lives. The curious thing was that with the loss of Paris threatening, we became more Parisian. The same thing, I had noted, had happened in our last few months in New York. The city, which had become increasingly difficult, suddenly seemed like a playground-people eating outside, in T-shirts and shorts and sneakers in the Italian restaurants in SoHo; the open-all-nightness of New York; the sweet funkiness-registered as it hadn't in years.