For a quick dose of happiness, gather up that loose change in the cushions of your couch or lying around the house and give it to a good cause. By some estimates, the average American household has as much as $90 lying under sofa cushions, in dresser drawers, and even in the laundry room (where a lot of it comes out in the wash). There are myriad ways to donate your loose change: drop the coins into charity boxes at grocery store checkout lines, give it to your church or temple, or simply donate it to your favorite charitable organization. Happiness researchers say that when you perform selfless acts of generosity for others, you increase your happiness.