This study investigates whether positive emotions can speed recovery from the cardiovascular sequelae of negative emotions. Two experiments were conducted to test this hypothesis. In Study 1, 60 participants viewed a fear-inducing film and were then shown secondary films that elicited contentment, amusement, neutrality, or sadness. Those who viewed positive secondary films exhibited faster returns to pre-film levels of cardiovascular activation compared to those who viewed neutral or negative films. In Study 2, 72 participants viewed a sad film, and 50 of them smiled at least once during the film. Smiling participants showed faster recovery from cardiovascular activation compared to those who did not smile. The findings suggest that positive emotions can act as "undoers" of the cardiovascular effects of negative emotions, facilitating recovery and restoring homeostasis.This study investigates whether positive emotions can speed recovery from the cardiovascular sequelae of negative emotions. Two experiments were conducted to test this hypothesis. In Study 1, 60 participants viewed a fear-inducing film and were then shown secondary films that elicited contentment, amusement, neutrality, or sadness. Those who viewed positive secondary films exhibited faster returns to pre-film levels of cardiovascular activation compared to those who viewed neutral or negative films. In Study 2, 72 participants viewed a sad film, and 50 of them smiled at least once during the film. Smiling participants showed faster recovery from cardiovascular activation compared to those who did not smile. The findings suggest that positive emotions can act as "undoers" of the cardiovascular effects of negative emotions, facilitating recovery and restoring homeostasis.