You know that warm, happy feeling you get when someone does something unexpectedly kind? It’s in our power to pass that on, or in more trendy terms, to “pay it forward.” There are lots of easy ways to make someone else feel like smiling—here are 10 to get you started! 1. Compliment a stranger. It doesn’t have to be over the top, but it should be sincere. If you notice something nice about someone, whether it’s their smile, their style, or something they say or do that gets your attention, tell them so! 2. Pay for someone in line behind you. Whether you’re running into a coffee shop for a latte or pulling through the drive-thru, give an extra $5 or $10 to the cashier and tell them to put it towards whatever the person behind you is buying. A..