Men are good at noticing what's wrong and bad at noticing what's right while it's happening. In a survey of adults, the people who told someone about good moments and stayed in them reported higher wellbeing; the ones who got distracted or moved straight on reported less. Evidence: worth trying
Correlation, self-report, no trial of doing it on purpose. But the mechanism is the same one that makes a good day feel like nothing happened: you were already thinking about the next thing.
It costs one sentence and feels slightly odd the first time.