You can stock up on as many Mega Millions lottery tickets as you want, but you know what they say: Even if you’re the (very!) lucky person who wins the big bucks, money can’t buy happiness. In fact, when it comes to experiencing true joy, you don’t even need to spend a cent. Science shows some of the simplest things are the true mood-boosters in life—not big houses, extravagant trips around the world, or nice cars. (Though, to be frank, those all sound pretty nice…) The next time you’re feeling down, these 33 things will surely make you smile.